Complex sentence: After the Battle of Waterloo and the final defeat of Napoleon in 1815, he was made a peer of France and received the title of Vicomte de Montmorency-Laval.
Split into simpler sentences: After the Battle of Waterloo and the final defeat of Napoleon in 1815, he was made a Peer of France. Two years later, Montmorency received the title of Vicomte de Montmorency-Laval.