Complex sentence: Henry was elected as a Republican to the Fifty-fourth and Fifty-fifth Congresses (March 4,1895-March 3,1899), but declined to be a candidate for renomination in 1898.
Split into simpler sentences: Henry was elected as a Republican to the Fifty-fourth and Fifty-fifth Congresses (March 4,1895-March 3,1899). He declined to be a candidate for renomination in 1898.