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Question:

What is the best way to combine these two sentences? "Marvin had been a fan of LeBron James since childhood. He was a card-carrying member of James' fan club."

A Marvin was a card-carrying member of LeBron James' fan club, having been a fan since childhood.
Explaination

This response, which doesn't alter the meaning of either sentence, is the only logical combination of the two sentences listed.