Complex sentence: In the TV movie "The Premiere", Rosalina asks to return in the band and they decide to keep Kristina as the group's bassist with Rosalina as the group's second guitarist.
Split into simpler sentences: In the TV movie "The Premiere", Rosalina hopes to return to the band and they must decide whether to keep Kristina or to have Rosalina back. The band decides to keep Kristina as the group's bassist with Rosalina as the group's second guitarist.