Complex sentence: Amy overhears the conversation and is disgusted at Zack for his true intentions and reveals that her last boyfriend, who was conniving, conceited, and impolited which was why she requested a transfer because she couldn't stand being with him.
Split into simpler sentences: Amy overhears the conversation and is disgusted at Zack for his true intentions. Amy reveals to Zack that her last boyfriend, who was conniving, conceited, and impolited which was why she requested a transfer because she couldn't stand being with him.