Complex sentence: The Army, on the other hand, opted to keep both cannon, but enlarge the airframe to accommodate larger tanks, resulting in the Ki-202, which was to have been the definitive Army version of the fighter.
Split into simpler sentences: The Army, on the other hand, opted to keep both cannons, but enlarge the airframe to accommodate larger tanks. This aircraft, the Ki-202 was to have been the definitive Army version of the fighter.