Complex sentence: Taking advantage of the situation, the Duke of Orleans, created a plan to evict the marriage between Maria Antoinette and Louis XVI, and made that one his partisans, dressed and act like the Princess.
Split into simpler sentences: Taking advantage of the situation, the Duke of Orlean created a plan to stop the marriage between Maria Antoinette and Louis XVI. He made that one his partisans dress and act like the Princess.