How can I write the condition

for (int p = 3; p < cmnMsgIdsRYGbuses.Count; p++)
{
   for (int i = 200; i < a5; i++)
   {
      if ((cmnMsgIdsRYGbuses[p] == CANMsgIdList[i].MsgId)
         && ((CANMsgIdList[i].Bus) == (Buses.CANBusRed)
         || (CANMsgIdList[i].Bus) == (Buses.CANBusYellow)
         || (CANMsgIdList[i].Bus) == (Buses.CANBusGreen)
         || (CANMsgIdList[i].Bus) == (Buses.CANBusOrange)))
      {
         for (int k = i + 1; k < b5; k++)
         {
            if ((cmnMsgIdsRYGbuses[p] == CANMsgIdList[k].MsgId)
               && ((CANMsgIdList[k].Bus) == (Buses.CANBusYellow))
               && (CANMsgIdList[k].TimeStamp > CANMsgIdList[i].TimeStamp))
            {
               for (int m = k + 1; m < c5; m++)
               {
                  if ((cmnMsgIdsRYGbuses[p] == CANMsgIdList[m].MsgId)
                     && ((CANMsgIdList[m].Bus) == (Buses.CANBusGreen))
                     && (CANMsgIdList[m].TimeStamp > CANMsgIdList[k].TimeStamp))
                  {
                     //k = b5;
                     //m = c5;
                     for (int n = m + 1; n < d5; n++)
                     {
                        if ((cmnMsgIdsRYGbuses[p] == CANMsgIdList[n].MsgId)
                           && ((CANMsgIdList[n].Bus) == (Buses.CANBusOrange))
                           && (CANMsgIdList[n].TimeStamp > CANMsgIdList[m].TimeStamp))
                        {
                           //int i1 = i; int k1 = k; int m1 = m;
                           for (int f = k + 1; f < m; f++)
                           {
                              if ((CANMsgIdList[i].MsgId == CANMsgIdList[f].MsgId))
                              {
                                 if ((CANMsgIdList[f].Bus) == (Buses.CANBusYellow))
                                 {
                                    buffer1.Add(f);
                                    q6++;
                                 }
                                 if ((CANMsgIdList[f].Bus) != (Buses.CANBusYellow))
                                 {
                                    check6 = "Invalid bus";
                                 }
                              }
                           }
                           for (int f = i + 1; f < k; f++)
                           {
                              if ((CANMsgIdList[i].MsgId == CANMsgIdList[f].MsgId))
                              {
                                 if ((CANMsgIdList[f].Bus) == (Buses.CANBusRed))
                                 {
                                    buffer2.Add(f);
                                    q6++;
                                 }
                                 if ((CANMsgIdList[f].Bus) != (Buses.CANBusRed))
                                 {
                                    check6 = "Invalid bus";
                                 }
                              }
                           }
                           for (int f = m + 1; f < n; f++)
                           {
                              if ((CANMsgIdList[i].MsgId == CANMsgIdList[f].MsgId))
                              {
                                 if ((CANMsgIdList[f].Bus) == (Buses.CANBusGreen))
                                 {
                                    buffer5.Add(f);
                                    q6++;
                                 }
                                 if ((CANMsgIdList[f].Bus) != (Buses.CANBusGreen))
                                 {
                                    check6 = "Invalid bus";
                                 }
                              }
                           }
                           if (buffer1.Count != 0)
                           {
                              int largestVal = buffer1[0];
                              foreach (int temp in buffer1)
                              {
                                 if (temp > largestVal)
                                    largestVal = temp;
                                 f6 = largestVal;
                              }
                              for (int z = f6 + 1; z < k; z++)
                              {
                                 if ((CANMsgIdList[i].MsgId == CANMsgIdList[z].MsgId))
                                 {
                                    buffer3.Add(z);
                                 }
                              }
                              buffer1.Clear();
                           }
                           if (buffer2.Count != 0)
                           {
                              int largestVal = buffer2[0];
                              foreach (int temp in buffer3)
                              {
                                 if (temp > largestVal)
                                    largestVal = temp;
                                 g6 = largestVal;
                              }
                              for (int z = g6 + 1; z < m; z++)
                              {
                                 if ((CANMsgIdList[i].MsgId == CANMsgIdList[z].MsgId))
                                 {
                                    buffer4.Add(z);
                                 }
                              }
                              buffer2.Clear();
                           }
                           if (buffer5.Count != 0)
                           {
                              int largestVal = buffer5[0];
                              foreach (int temp in buffer3)
                              {
                                 if (temp > largestVal)
                                    largestVal = temp;
                                 j6 = largestVal;
                              }
                              for (int z = j6 + 1; z < n; z++)
                              {
                                 if ((CANMsgIdList[i].MsgId == CANMsgIdList[z].MsgId))
                                 {
                                    buffer6.Add(z);
                                 }
                              }
                              buffer5.Clear();
                           }
                           if ((buffer3.Count != 0) || (buffer4.Count != 0) || (check6 == "Invalid bus") || (buffer5.Count != 0))
                           {
                              k = b5;
                              m = c5;
                              n = d5;
                              check6 = null;
                              buffer3.Clear();
                              buffer4.Clear();
                              buffer6.Clear();
                           }
                           else
                           {
                              yellowTimeStampRYGOcmnMsgIds.Add(CANMsgIdList[k].TimeStamp);
                              redTimeStampRYGOcmnMsgIds.Add(CANMsgIdList[i].TimeStamp);
                              greenTimeStampRYGOcmnMsgIds.Add(CANMsgIdList[m].TimeStamp);
                              orangeTimeStampRYGOcmnMsgIds.Add(CANMsgIdList[n].TimeStamp);
                              GatewayRYGOmsgId.Add(CANMsgIdList[i].MsgId);
                              k = b5;
                              i = a5;
                              m = c5;
                              n = d5;
                           }
                        }
                     }
                  }
               }
            }
         }
      }
   }
}