Complex sentence: In season 4 Matt asks Sue to the school valentine dance because he broke up with his girlfriend Sherrie, but calls Sue at the last minute to say that they have got back together and he is no longer taking her to the dance.
Split into simpler sentences: In season 4, Matt asks Sue to the school Valentine's Day dance because he broke up with his girlfriend Sherrie. He later calls Sue at the last minute to say that he and Sherrie got back together, and he is no longer taking her to the dance.