Complex sentence: This uniform now serves as the team's alternate or "third jersey" and is usually worn at least once a year, although team has used their normal white uniforms on Thanksgiving in 2007 and 2008.
Split into simpler sentences: This uniform now serves as the team's alternate or "third jersey" and is usually worn at least once a year. Two exceptions were when the Cowboys wore their normal white uniforms on Thanksgiving in 2007 and 2008.