Complex sentence: Huntsman served as Governor of Utah from January 2005 until August 2009, but resigned during the first year of his second term to serve as United States Ambassador to China, a position to which he was appointed by Democratic President Barack Obama.
Split into simpler sentences: Huntsman served as Governor of Utah from January 2005 until August 2009. He resigned as Governor during the first year of his second term to serve as United States Ambassador to China, a position to which he was appointed by Democratic President Barack Obama.