Simplify the following text for a Grade 11 native English-speaking person.
Original: The British ( also known as Britons , informally Brits , or archaically Britishers ) are citizens of the United Kingdom , of the Isle of Man , any of the Channel Islands , or of any of the British overseas territories , and their descendants .
Simplified: British people , or Britons , are the people who live in Great Britain or citizens of the United Kingdom , of the Isle of Man , one of the Channel Islands , or of one of the British overseas territories .