Complex sentence: NASA incorporated stiffened Rogallo wings into man-lifting kites towed by ground and aero vehicles and often let in hang glide mode; many of the kited men (eight) were released from the kited format into gliding controlled flight back to ground.
Split into simpler sentences: NASA incorporated stiffened Rogallo wings into man-lifting kites towed by ground and aero vehicles and often let in hang glide mode. Many of the kited men (eight) were released from the kited format into gliding controlled flight back to ground.