Complex sentence: Hays was elected as a Republican to the Forty-first and to the three succeeding Congresses (March 4,1869-March 3,1877) and served as chairman of the Committee on Agriculture (Forty-third Congress).
Split into simpler sentences: Hays was elected as a Republican to the Forty-first and to the three succeeding Congresses (March 4,1869-March 3,1877). He served as chairman of the Committee on Agriculture (Forty-third Congress).