Tavares--starter or reliever?

Throughout his career, Julian Tavares has been back and forth like a yo-yo between starting and relieving. He started in 8 of his first 9 games in the majors, 1993-4. He then relieved in 300 of his next 304 games, 1995-99. 2000 was a transition year: he started 12 times and relieved 39 times. He then started 55 of 63 games in 2001-02. From 2003-2006, it was back to relieving 267 out of 273 games. In 2007, he started 23 out of 34 games. And this past year, 2008, he relieved in all 52 games he appeared in. Starting-relieving-starting-relieving-starting-relieving. I wonder if ANY other players have been switched form one to the other so many times in their careers?