Complex sentence: ' reveals that Luke was raised on Tatooine by his step-aunt and uncle (Beru and Owen Lars), while Leia was raised by Senator Bail Organa and Queen Breha Organa on Alderaan.
Split into simpler sentences: 'reveals that Luke's caregivers on Tatooine, Beru and Owen Lars, are his step-aunt and uncle. Leia is raised by Senator Bail Organa and Queen Breha Organa on Alderaan.