Complex sentence: Later, he fights the Turtles and April in the Turtle Mech, but is defeated when he gets electrocuted with power siphoned from the city's power grid that results in it going down.
Split into simpler sentences: Later, he fights the Turtles and April in the Turtle Mech. He is then defeated when he gets electrocuted with power siphoned from the city's power grid that results in it going down.