Complex sentence: It quickly becomes apparent that Peter is attracted to Sarah, but doesn't pursue her; during a later argument with Cassie, Peter says he is struck by Sarah's ambitious drive and contrasts it to what he perceives as Prue's reckless behavior.
Split into simpler sentences: It quickly becomes apparent that Peter is attracted to Sarah, but doesn't pursue her. Later, during an argument with Cassie, Peter says he is struck by Sarah's ambitious drive and contrasts it to what he perceives as Prue's reckless behavior.