Complex sentence: Schmidt decides to throw a party at his house to gain Eric's complete trust; at the party, Jenko's AP Chemistry friends tap into Eric's phone while Schmidt and Eric get into a fight with some of Eric's rivals.
Split into simpler sentences: Schmidt decides to throw a party at his house to gain Eric's complete trust and Jenko takes the opportunity to tap into Eric's phone. At the party, Jenko's friends tap into Eric's phone while Schmidt and Eric get into a fight with some of Eric's rivals.