Complex sentence: Mallen was defeated but refused to give up, forcing Iron Man to kill him, blowing up his head with his repulsors, even after which his then headless body began to get up, falling down shortly afterwards.
Split into simpler sentences: Mallen was defeated but refused to give up, forcing Iron Man to kill him, blowing up his head with his repulsors. Even after which his then headless body began to get up, falling down shortly afterwards.