Complex sentence: The female feline initially reciprocates Tom's feelings, but Tom's rival, the much wealthier Butch, is suddenly smitten by her as well, rudely interrupting her date with Tom to make his move.
Split into simpler sentences: The female feline initially reciprocates Tom's feelings, but things took a turn for the worst. Butch is suddenly smitten by her as well, rudely interrupting her date with Tom to make his move.