Complex sentence: Misjudging his distance from the bridge, Weston struck a railing while traveling an estimated 120 mph, severing his leg at the hip and falling onto a ledge in the gorge under a parachute that had opened on impact, though it is assumed he had already died.
Split into simpler sentences: Misjudging his distance from the bridge, Weston struck a railing while traveling an estimated 120 mph, severing his leg at the hip. He fell onto a ledge in the gorge under a parachute that had opened on impact, though it is assumed he had already died.