Complex sentence: Leia's message explains that R2 contains the plans to the Death Star, which must be sent to her father on her home planet of Alderaan; she then says that Obi-Wan owes her family for covering up his "little problem".
Split into simpler sentences: Leia's message explains that R2 contains the plans to the Death Star, which must be sent to her father on her home planet of Alderaan. She then says that Obi-Wan owes her family for covering up his "little problem".