Complex sentence: As the French foot soldiers fell back, Cotton ordered Le Marchant's heavy brigade (5th Dragoon Guards, 3rd and 4th Dragoons) to attack them in what was probably the most destructive charge made by a single brigade of cavalry in the whole Napoleonic period.
Split into simpler sentences: As the French foot soldiers fell back, Cotton ordered Le Marchant's heavy brigade (5th Dragoon Guards, 3rd and 4th Dragoons) to attack them. In what was probably the most destructive charge made by a single brigade of cavalry in the whole Napoleonic period.