Complex sentence: Republican members credited this election platform with the Republican takeover of Congress, rewarding Gingrich with the position of Speaker of the United States House of Representatives and Armey with the position of House Majority Leader.
Split into simpler sentences: Republican members credited this election platform with the Republican takeover of Congress. Gingrich became Speaker of the United States House of Representatives, and Armey became Gingrich's second-in-command as House Majority Leader.