Complex sentence: Back at the facility, Galvatron reactivates himself and takes control of the K.S.I. drones, and a battle follows in Hong Kong's streets between the Autobots, Cemetery Wind, and Galvatron and his drones.
Split into simpler sentences: Back at the facility, Galvatron reactivates himself and takes control of the K.S.I. drones. Afterwards, a battle ensues in Hong Kong's streets between the Autobots, Cemetery Wind, and Galvatron and his drones.