Complex sentence: He was sent to fight Robin of Redesdale, one of the commanders of Richard Neville, 16th Earl of Warwick, divided his own forces, and was captured and beheaded at Bridgwater, 17 August 1469.
Split into simpler sentences: He was sent to fight Robin of Redesdale, a deputy of Warwick. Stafford divided his own forces, and was captured and beheaded at Bridgwater, 17 August 1469.