Complex sentence: The stability offered by the rigid rotor control system made the helicopter easy to fly, and the lessons learned from the CL-475 rigid rotor were later used to develop the XH-51 and AH-56A Cheyenne.
Split into simpler sentences: The stability offered by the rigid rotor control system made the helicopter easy to fly. The lessons learned from the CL-475 rigid rotor were later used to develop the XH-51 and AH-56A Cheyenne.