Complex sentence: Palutena sends Pit to eliminate Dark Pit, believing him to be a threat, but in amidst of this, Dark Pit attempts to destroy Pit as well, convinced that he himself is the true Pit.
Split into simpler sentences: Palutena sends Pit to eliminate Dark Pit, believing him to be a threat. In amidst of this, Dark Pit attempts to destroy Pit as well, convinced that he himself is the true Pit.