Complex sentence: Fineman became most well known for his coverage of U.S. Presidential campaigns during this time, having interviewed and reported on every major presidential candidate who ran for office between 1985 and 2008, including George W. Bush and Barack Obama.
Split into simpler sentences: Fineman became most well known for his coverage of U.S. Presidential campaigns during this time. He interviewed and reported on every major presidential candidate who ran for office between 1985 and 2008, including George W. Bush and Barack Obama.