Complex sentence: In 2003 she appeared as Joanna Sharpe in "The Bill", and has since appeared as Roseanne Speedwell on "The New Worst Witch" in 2005 and as Selena on the hit children's TV show "My Parents Are Aliens" in 2006.
Split into simpler sentences: In 2003 she appeared as Joanna Sharpe in The Bill, and has since appeared as Roseanne Speedwell on The New Worst Witch in 2005. And more recently as Selena on the hit children's TV show My Parents Are Aliens in 2006.