Complex sentence: Luc originally wanted her to play the roll from the start, but Maïwenn refused to take the roll, believing it to be wrong that she would be working for the same man she was in a relationship with.
Split into simpler sentences: Luc originally wanted her to play the roll from the start, but Maïwenn refused to take the roll. She believed it to be wrong that she would be working for the same man she was in a relationship with.