Complex sentence: Colossus eventually agrees to work for Cyclops for 364 days a year, but on the anniversary of Magik's capture, Peter gets to lead a team of volunteers to try a rescue attempt.
Split into simpler sentences: Colossus eventually agrees to work for Cyclops for 364 days a year. But on the anniversary of Magik's capture, Peter gets to lead a team of volunteers to try a rescue attempt.