Complex sentence: In 2010, she became the second person (and first woman, and first incumbent) to be elected to the U.S. Senate via write-in votes; the only other person to do so was Strom Thurmond in 1954.
Split into simpler sentences: In 2010, she became the second person (as well as the first woman and the first incumbent) to be elected to the U.S. Senate via write-in votes. The only other person to do so was Strom Thurmond in 1954.