How Can I Model This On Uml Diagram In This Case

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C#

UML

hi. i'm using staruml modeling tool. (but i'm novice to model in umlㅠㅠ)
while i made a simple C# code and convert this code into uml, i am hit the roadblock. how should i express below codes in uml models.

Code:

public static IDataLayer GetInstance()
{
    DatabaseTypes dbType = ConvertDBType(GetAppConfigSettings(~~~~~));
    return GetInstance(dbtype, GetAppConfigSettings(Constants.AppConfigurationString, true),
                               GetAppConfigSettings(Constants.AppConfiguration, false) != false.ToString());
}

there is another operation(function) inner an operation (procedure)

if there are anybody know the how, then let me know please. thanks. ^^