Complex sentence: However in the 1954 Congressional elections the Democrats, who had made an issue of Dixon-Yates, won control of the House and Senate and in 1955 they gained chairmanship and majority control of the JCAE.
Split into simpler sentences: However in the 1954 Congressional elections the Democrats, who had made an issue of Dixon-Yates, won control of the House and Senate. In 1955 they gained chairmanship and majority control of the JCAE.