Complex sentence: Parker had built it for model sequences in "Strategic Air Command" (1955); the rig was two construction cranes and a hydraulically operated device to tilt and position a model, along with 200 ft (61 m) of cables.
Split into simpler sentences: Parker had built it for model sequences in "Strategic Air Command" (1955). The rig was two construction cranes and a hydraulically operated device to tilt and position a model, along with 200 ft (61 m) of cables.