Complex sentence: Shockwave completed work on his new warrior, Sixshot but Megatron's return, accompanied by with three clone warriors and the Predacons, was able to defeat Shockwave.
Split into simpler sentences: Shockwave completed work on his new warrior, Sixshot. Megatron returned to Cybertron with three clone warriors and the Predacons and was able to defeat Shockwave.