Simplify the following text for a Grade 11 native English-speaking person.
Original: He wrestled in Mexico , Japan , Extreme Championship Wrestling ( ECW ) , World Championship Wrestling ( WCW ) and , most famously , in World Wrestling Entertainment ( WWE ) .
Simplified: He wrestled in Mexico and Japan for several major professional wrestling promotions . In the United States , Guerrero wrestled in Extreme Championship Wrestling ( ECW ) , World Championship Wrestling ( WCW ) , and in World Wrestling Entertainment ( then WWF , later renamed to WWE ) .