Merging multiple XSD files

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XSD

I have multiple XSD files and i need to merge all the XSD files into one single xsd file .

the XSD files are huge and it should be merged with the root elements.

<xs:element name="Derby" type="DerbyInfo" />
  <xs:complexType name="DerbyInfo">

What I have tried:

As of now i do it manually, can we automate the process ?.