Complex sentence: In 1835, Ellsworth was elected mayor of Hartford, Connecticut, but served only one month when he was appointed the first Commissioner of the U.S. Patent Office between 1835 and 1845.
Split into simpler sentences: In 1835, Ellsworth was elected mayor of Hartford, Connecticut, but served only one month. He was appointed the first Commissioner of the U.S. Patent Office between 1835 and 1845.