Complex sentence: Impactor was convinced by Xaaron that he would lose the glory if Magnus returned and he wasn't ready, while the other Wreckers rejoined after seeing Decepticon bullying first-hand in a bar.
Split into simpler sentences: Impactor was convinced by Xaaron that he would lose the glory if Magnus returned and he wasn't ready. The other Wreckers rejoined after seeing Decepticon bullying first-hand in a bar.