Complex sentence: Sebring campaigned for the United States House of Representatives from Wisconsin's 4th congressional district as a write-in candidate in 2008 and then in 2010 and 2012 as the Republican nominee.
Split into simpler sentences: Sebring campaigned for the United States House of Representatives from Wisconsin's 4th congressional district three times. First, as a write-in candidate in 2008 and then in 2010 and 2012 as the Republican nominee.