Simplify the following text for a Grade 15 native English-speaking person.
Original: WrestleMania XXV ( also known as `` The 25th Anniversary of WrestleMania '' ) was the twenty-fifth annual WrestleMania professional wrestling pay-per-view ( PPV ) event produced by World Wrestling Entertainment ( WWE ) , which took place on April 5 , 2009 at Reliant Stadium in Houston , Texas .
Simplified: WrestleMania XXV ( or The 25th Anniversary of WrestleMania or WrestleMania 25 ) , was the twenty-fifth yearly WrestleMania professional wrestling Pay-per-view produced by World Wrestling Entertainment and took place on April 5 , 2009 at Reliant Stadium in Houston , Texas .