Complex sentence: Though the office is officially nonpartisan, Begich was the first Democrat to be elected Mayor of the Municipality of Anchorage since Tony Knowles, who was later elected to two terms as Governor of Alaska.
Split into simpler sentences: Though the office is officially nonpartisan, Begich was the first Democrat to be elected Mayor of the Municipality of Anchorage since Tony Knowles. Knowles was later elected to two terms as Governor of Alaska.