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The majority of his jobs while with this company were mainly comprised of LDS churches.
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I don't understand this sentence. What is an LDS church? What does at job at an LDS church involve doing? I need to know this before I can critique your sentence.
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Hi,

The majority of his jobs while with this company were mainly comprised of LDS churches.

A job can involve a church, or it can consist of doing something to a church, but a job cannot comprise a church.

The majority . . . mainly . . . These words do not fit well together in your sentence.

You could say The majority of his jobs while with this company involved LDS churches.

Best wishes, Clive
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Comments  
I dont have the answer. I'm struggling myself.
 Clive's reply was promoted to an answer.
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I believe LDS Churches refers to The Church of Jesus Christ of Latter-Day Saints -- more commonly known as the Mormon Church. (Not to be confused with LSD churches!)