Complex sentence: He was the presidential nominee of the Socialist Party USA for the 2008 United States presidential election; has waged several unsuccessful campaigns for mayor and city council in Washington, D.C.; and twice ran for the United States House of Representatives from Florida's 5th congressional district.
Split into simpler sentences: He was the presidential nominee of the Socialist Party USA for the 2008 United States presidential election. He waged several unsuccessful campaigns for mayor and city council in Washington, D.C. and twice ran for the United States House of Representatives from Florida's 5th congressional district.