Complex sentence: With the day saved, Optimus Prime loads all of the Decepticons onto his ship along with the Dark Star Saber before leaving to hand them over to the Cybertronian Authorities.
Split into simpler sentences: With the day saved, Optimus Prime loads all of the Decepticons onto his ship along with the Dark Star Saber. He then leaves to hand them over to the Cybertronian Authorities.