Complex sentence: The vehicle has four mounts for additional external fuel tanks located on the rear of the hull; the two on the hull corners are for a flat external tanks, whereas the two in the center are for a drum-type of tank.
Split into simpler sentences: The vehicle has four mounts for additional external fuel tanks at the rear of the hull. The two mounts on the corners of the hull are for a flat external tank, the two mounts in the center of the rear of the hull are for a drum-type of tank.