Complex sentence: He received intelligence that Grandison's and Fitzwalter's forces were spread out in encampments between Pontvallain and Mayet and, despite his army's exhaustion, ordered an immediate night march, arriving at Pontvallain to attack the English at dawn on 4 December.
Split into simpler sentences: He received intelligence that Grandison's and Fitzwalter's forces were spread out in encampments between Pontvallain and Mayet and. Despite his army's exhaustion, he ordered an immediate night march, arriving at Pontvallain to attack the English at dawn on 4 December.