Complex sentence: During the rout, Talbot's horse was killed by a cannon ball and he fell, trapped beneath it, until a Frenchman, a "Francs Archer", recognized him and killed him with a hand-axe.
Split into simpler sentences: During the rout, Talbot's horse was killed by a cannon ball and he fell, trapped beneath it. A "Francs Archer" recognized him and killed him with a hand-axe.