Complex sentence: Metroplex battles his Decepticon counterpart Broadside, controlled by the vengeful Dreadwing, but he becomes disgusted at his cause, and thus saving Metroplex from the Decepticons.
Split into simpler sentences: Metroplex battles his Decepticon counterpart, Broadside, controlled by the vengeful Dreadwing. Dreadwing eventually becomes disgusted at his cause, and saves Metroplex from the Decepticons.