Complex sentence: After leaving Paris, Flaubert returned to Croisset, near the Seine, close to Rouen, and lived with his mother in their home for the rest of his life; with occasional visits to Paris and England, where he apparently had a mistress.
Split into simpler sentences: After leaving Paris, he returned to Croisset, near the Seine, close to Rouen, and lived with his mother in their home for the rest of his life. He made ith occasional visits to Paris and England, where he apparently had a mistress.