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What is the subject and simple predicate of this sentence?

In every chapter of this book, mention has been made of the money-making secret which has made fortunes for hundreds of exceedingly wealthy men whom I have carefully analyzed over a long period of years.

Thanks

A money making secret which made fortunes for hundreds of exceedingly wealthy men whom I have carefully been analyzing for years had been mentioned in every chapter of this book.

Owing to the Passive Voice the subject's devalued to the not mentioned agent of the passive verb in the sentence.

had been mentioned could be the predicate.

A money making secret could be the object

which made fortunes for hundreds of exceedingly wealthy men could be the defining relative clause (describes the secret)

whom I have carefully been analyzing for years could be another but rather non-defining relative clause (describes the noun men)