Complex sentence: The 200 strong choir have also performed for Princess Anne, at prestigious venues across London and won the Under-18's Choir Class at the North London Festival of Music and Drama in 2005,2007 and 2008.
Split into simpler sentences: The 200 strong choir has also performed for Princess Anne and at prestigious venues across London. They won the Under-18's Choir Class at the North London Festival of Music and Drama in 2005,2007 and 2008.