Complex sentence: During the series, both droids are owned by Bail Organa who has tasked R2-D2 with secret missions to undermine Imperial activities, previous to the rise of the Empire, both droids were formerly owned by the deceased close friend of Bail Organa, Padmé Amidala.
Split into simpler sentences: During the series, both droids are owned by Bail Organa who has tasked R2-D2 with secret missions to undermine Imperial activities. Prior to the rise of the Empire, both droids were formerly owned by the deceased close friend of Bail Organa, Padmé Amidala.