Complex sentence: By the time the Franco-Scots army arrived in Vieil-Baugé area, the English forces were dispersed, many archers having ridden off in search of plunder or forage.
Split into simpler sentences: By the time the Franco-Scots army arrived in Vieil-Baugé area, the English forces were dispersed. Significantly many of the archers had ridden off in search of plunder or forage.