Simplify the following text for a Grade 9 native English-speaking person.
Original: FuÃ ball-Club Gelsenkirchen-Schalke 04 , commonly known as simply FC Schalke 04 or Schalke , is a German association football club originally from the Schalke district of Gelsenkirchen , North Rhine-Westphalia .
Simplified: The FuÃ ball-Club Gelsenkirchen-Schalke 04 , commonly known as FC Schalke 04 , is a successful and popular German football club .