Complex sentence: He was elected as a Republican to the Fifty-third and Fifty-fourth Congresses (March 4,1893-March 3,1897); chairman, Committee on Elections No.1 (Fifty-fourth Congress).
Split into simpler sentences: He was elected as a Republican to the Fifty-third and Fifty-fourth Congresses (March 4,1893--March 3,1897). He served as chairman, Committee on Elections No.1 (Fifty-fourth Congress).