Original sentence: Although sometimes referred to as a conservative, O'Reilly is a self-described independent and has used several terms to describe his views.Previously a registered Republican, O'Reilly has been registered as having no party affiliation since 2001
Edited sentence: O'Reilly is a self-described independent and has used several terms to describe his views.Previously a registered Republican for an unknown period of time and described as a conservative by his Fox News Channel colleagues , O'Reilly has been registered as having no party affiliation since 2001