Complex sentence: He was elected as a Republican to the 54th, 55th, 56th, and 57th congresses, (March 4 1895--March 3 1903); he was chairman of the Committee on Ventilation and Acoustics (55th congress).
Split into simpler sentences: He was elected as a Republican to the 54th, 55th, 56th, and 57th congresses, (March 4 1895--March 3 1903). He served as chairman of the Committee on Ventilation and Acoustics (55th congress).