Complex sentence: That night, John comes upon Rachel as she bathes, and she stands half-naked before him, but he walks away, explaining the next morning that if they had made love the night before he would have to stay or she would have to leave.
Split into simpler sentences: That night, John comes upon Rachel as she bathes, and she stands half-naked before him, but he walks away. The next morning John tells Rachel that if they had made love the night before he would have to stay or she would have to leave.