Simplify the following text for a Grade 12 native English-speaking person.
Original: SummerSlam ( 2009 ) was a professional wrestling pay-per-view event produced by World Wrestling Entertainment ( WWE ) , which took place on August 23 , 2009 at Staples Center in Los Angeles , California .
Simplified: SummerSlam ( 2009 ) was a professional wrestling pay-per-view ( PPV ) event produced by World Wrestling Entertainment ( WWE ) , which took place on August 23 , 2009 at Staples Center in Los Angeles , California .