Complex sentence: For instance, Keegan disputes the effectiveness of cavalry charges in even the middle ages-in Agincourt, the lightly armored archers dug stakes into the ground to impede horses, while heavy infantry who stood their ground had little to fear from cavalry.
Split into simpler sentences: For instance, Keegan disputes the effectiveness of cavalry charges in even the Middle Ages. At Agincourt, the lightly armored archers dug stakes into the ground to impede horses, while heavy infantry who stood their ground had little to fear from cavalry.