Complex sentence: Poppy's father comes to the game of the lacrosse finals, and is shocked by Poppy's dramatic change in appearance and how much she looks like her mother, also captain of the lacrosse team at Abbey Mount.
Split into simpler sentences: Poppy's father comes to the game of the lacrosse finals. He is shocked by Poppy's dramatic change in appearance and how much she looks like her mother, also captain of the lacrosse team at Abbey Mount.