Simplify the following text for a Grade 9 native English-speaking person.
Original: Sunderland based schoolteacher James Allan founded the Sunderland District & Teachers Association Football Club on 17 October 1879 . The name of the club was changed to Sunderland Association Football Club in 1881 , after other professions were allowed to join .
Simplified: Sunderland Association Football Club is an English football club .