Complex sentence: Collins became known as one of the best read men in England, he was a bibliophile who amassed one of the largest private libraries of the time, consisting of some 6,906 books on all subjects, but particularly favoring works on history, theology, and philosophy.
Split into simpler sentences: Collins became known as one of the best read men in England. He was a bibliophile who amassed one of the largest private libraries of the time, consisting of some 6,906 books on all subjects, but particularly favoring works on history, theology, and philosophy.