Complex sentence: Pierre Adolphe Chéruel (1809--1891) was French historian and the author of "History of France during the Minority of Louis XIV" and "Memoirs of Saint-Simon".
Split into simpler sentences: Pierre Adolphe Chéruel (1809-1891) was French historian. Author of "History of France during the Minority of Louis XIV" and "Memoirs of Saint-Simon".