Complex sentence: After Napoléon's defeat at Waterloo a Bourbon, Louis XVIII, the brother of Louis XVI, was restored to power in 1814, Vigny enrolled in one of the privileged aristocratic companies of the "Maison du Roi".
Split into simpler sentences: After Napoléon's defeat at Waterloo, a Bourbon, Louis XVIII, the brother of Louis XVI, was restored to power. In 1814, Vigny enrolled in one of the privileged aristocratic companies of the "Maison du Roi".