Complex sentence: In the battle that ensued, the Nemesis attached to the Ark via it's tractor beam and the Decepticons initiated a boarding, and as the two factions battled aboard the Ark, the G-forces of the nearby planet Earth dragged both ships down.
Split into simpler sentences: In the battle that ensued, the Nemesis attached itself to the Ark via its tractor beam and the Decepticons initiated a boarding. As the two factions battled aboard the Ark, the G-forces of a nearby planet-Earth-dragged both ships down.