Complex sentence: Krishnamoorthi was the policy director and a senior advisor for Barack Obama's 2004 U.S. Senate campaign, and also served as an advisor to Obama's 2008 Presidential campaign.
Split into simpler sentences: Krishnamoorthi was the policy director and a senior advisor for Barack Obama's 2004 U.S. Senate campaign. He also served as an advisor to Obama's 2008 Presidential campaign.