Complex sentence: Optimus knocks the Fallen and Megatron off the pyramid, destroying the Sun Harvester in the process, then disables Megatron and kills the Fallen; vowing vengeance, Megatron retreats with Starscream.
Split into simpler sentences: Optimus knocks the Fallen and Megatron off the pyramid, destroying the Sun Harvester in the process. In the battle, Optimus disables Megatron and kills the Fallen; vowing vengeance, Megatron retreats with Starscream.