Complex sentence: Cambridge University Press (2004) At this point, there were already negotiations of marriage between Marie and the Duke of Bourbon, the Duke of d'Argensson had already left a favorable report of her, and the groundwork had been done.
Split into simpler sentences: Cambridge University Press (2004) At this point, there were already negotiations of marriage between Marie and the Duke of Bourbon. The Duke of d'Argensson had already left a favorable report of her, and the groundwork had been done.