Complex sentence: Tricia developed an attraction to Curly and they began dating but the relationship ended when Tricia's ex-husband, Carl, assaulted Jack Duckworth who had been babysitting Jamie whilst she and Curly were out on a date.
Split into simpler sentences: Tricia developed an attraction to Curly and they began dating. But the relationship ended when Tricia's ex-husband Carl assaulted Jack Duckworth who had been babysitting Jamie whilst she and Curly had been out on a date.