Complex sentence: "Metamorphosis One" is played in an episode of "Battlestar Galactica" by Kara "Starbuck" Thrace; in-universe, her father composed and performed the piece.
Split into simpler sentences: Metamorphosis One is played in an episode of "Battlestar Galactica"by Kara "Starbuck" Thrace. Within the narrative, her father composed and performed the piece.