Simplify the following text for a Grade 14 native English-speaking person.
Original: Worcester Cathedral has three choirs : the Worcester Cathedral Choir ( the main choir which has both a boys ' and a girls ' treble line , which normally work independently ) , Worcester Cathedral Chamber Choir , and the Worcester Cathedral Voluntary Choir .
Simplified: Worcester Cathedral has three choirs : the Worcester Cathedral Choir ( the main choir which has both a boys ' and a girls ' treble line , which normally work separately ) , Worcester Cathedral Chamber Choir , and the Worcester Cathedral Voluntary Choir .