Complex sentence: Since 2005, she has a recurring role as Wendy Simms on', as of the tenth season, Vassey has been promoted to a regular cast member and appears in the show's opening credits.
Split into simpler sentences: Since 2005, Vassey has had a recurring role as Wendy Simms on'. Starting with the tenth season, Vassey was promoted to a regular cast member and has been appearing in the show's opening credits.