BizTalk 2013 Orchestration fails with Error "The Stylesheet is too Complex"

I recently came across an issue in which, after doing an upgrade from BizTalk 2010 to BizTalk 2013, BizTalk mapper functionality broke and started to get the following error:  Error Message:xlang/s engine event log entry: Uncaught exception (see the ‘inner exception’ below) has suspended an instance of service ‘ABC’The service instance will remain suspended until…

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