Complex sentence: During the final stages of the Battle of Worcester, fought on 3 September 1651, the last battle of the war and a Parliamentary victory, the Royalists retreat turned into a rout in which Parliamentarian and Royalist forces intermingled and skirmished up to and into the city.
Split into simpler sentences: During the final stages of the Battle of Worcester, fought on 3 September 1651, the last battle of the war and a Parliamentary victory. As the Royalists retreat turned into a rout in which Parliamentarian and Royalist forces intermingled and skirmished up to and into the city.