Complex sentence: Knapp was a Republican member of the New York State Assembly representing Delaware County, New York from 1886 to 1889 and represented the New York's 17th congressional district in the United States House of Representatives between 1889 and 1891.
Split into simpler sentences: Knapp was a Republican member of the New York State Assembly (Delaware Co.) in 1886. He represented New York's 17th congressional district in the United States House of Representatives from 1889 and 1891.