Complex sentence: In this book, he states that if he had been prosecuting the case, he would have put at least 500 hours of preparation into his final summation, and that it was obvious that Clark and Darden had waited until the night before to prepare theirs.
Split into simpler sentences: In this book, he states that if he had been prosecuting the case, he would have put at least 500 hours of preparation into his final summation. He believed that Clark and Darden had waited until the night before to prepare theirs.