Complex sentence: The next morning, they sneak into the motorhome of Frank Bowers (Daniel Bonjour), drug dealer and friend of Rachel, and learn that Rachel was in a relationship with Frank and lied to Chloe about it, causing Chloe to storm off feeling betrayed.
Split into simpler sentences: The next morning, they sneak into the motorhome of Frank Bowers (Daniel Bonjour), a drug dealer and Rachel's friend. They learn that Rachel was in a romantic relationship with Frank and lied to Chloe about it, causing Chloe to storm off feeling betrayed.