Complex sentence: After confronting Corrine, Bart demands for Cathy to explain why she seduced him to get back at his wife, and she says that while she cares about him, she did it for reasons he could never understand.
Split into simpler sentences: After confronting Corrine, Bart demands for Cathy to explain why she seduced him to get back at his wife. She says that, while she cares about him, she has done this for reasons he could never understand.