Complex sentence: Mississippi and Alabama sent uncommitted electors to the Electoral College: eventually, these voted for Harry F. Byrd, segregationist Democratic Senator from Virginia, for President, and Strom Thurmond, segregationist Democratic Senator from South Carolina, for Vice-President.
Split into simpler sentences: Mississippi and Alabama sent uncommitted electors to the Electoral College. Eventually, these voted for Harry F. Byrd, a segregationist Democratic senator from Virginia, for president, and Strom Thurmond, segregationist Democratic senator from South Carolina, for vice-president.