Complex sentence: He wrestled in Mexico and Japan for several major professional wrestling promotions, and in the United States, performed for Extreme Championship Wrestling (ECW), World Championship Wrestling (WCW), and World Wrestling Entertainment (WWE).
Split into simpler sentences: He wrestled in Mexico and Japan for several major professional wrestling promotions. In the United States, he wrestled in Extreme Championship Wrestling (ECW), World Championship Wrestling (WCW), and in World Wrestling Entertainment (WWE).