Complex sentence: They love the same books and movies and often say the same things at the same time involuntarily, and she also dislikes Karl just like Avery, however, Avery dislikes Karl more than she does.
Split into simpler sentences: They love the same books and movies and often say the same things at the same time involuntarily, and she also dislikes Karl just like Avery. However, Avery dislikes Karl more than she does.