Complex sentence: Louis XVI (23 August 1754--21 January 1793), born Louis-Auguste, was the last King of France before the French Revolution, after which the victors renamed him Citizen Louis Capet during the final weeks of his life.
Split into simpler sentences: Louis XVI (23 August 1754--21 January 1793), born Louis-Auguste, was the last King of France before the fall of the monarchy during the French Revolution. He was referred to as Citizen Louis Capet during the final weeks of his life.