Complex sentence: Grouchy, however, had written and verbal orders from Napoleon to march on Wavre and engage the Prussians Roberts., pg.53, and knew that Marshal Ney had been taken to task by Napoleon two days earlier for not following orders at the Battle of Quatre Bras.
Split into simpler sentences: Grouchy, however, had written and verbal orders from Napoleon to march on Wavre and engage the Prussians Roberts., pg.53. Hofschroer, p156 Marshal Ney had been taken to task by Napoleon two days earlier for not following orders at the Battle of Quatre Bras.