Complex sentence: He continued to live on at Coppet, under the care of his daughter, Madame de Staël, and his niece, Madame Necker de Saussure, but his time was past, and his books had no political influence.
Split into simpler sentences: He continued to live on at Coppet, under the care of his daughter, Madame de Staël, and his niece, Madame Necker de Saussure. But his time was past and his books had no political influence.