Complex sentence: He was supervisor of the town of Catskill from 1860 to 1864 and was elected as a Democrat to the Forty-fourth Congress, holding office from March 4,1875 to March 3,1877.
Split into simpler sentences: He was supervisor of the town of Catskill from 1860 to 1864. He served from March 4,1875 to March 3,1877.