Complex sentence: Accordingly William set his army in motion before dawn on August 3rd to surprise the French right about Steenkerque, having completely misled the enemy by forcing a detected spy to give Luxemburg false news.
Split into simpler sentences: Accordingly William set his army in motion before dawn on August 3rd and surprised the French right about Steenkerque. He completely misled the enemy by forcing a detected spy to give Luxemburg false news.