Simplify the following text for a Grade 12 native English-speaking person.
Original: After World Wrestling Entertainment ( WWE ) bought all of Extreme Championship Wrestling ( ECW ) 's assets in 2003 , the company began releasing DVDs promoting the original ECW .
Simplified: After World Wrestling Entertainment ( WWE ) bought all of Extreme Championship Wrestling ( ECW ) in 2003 , the company began releasing DVDs showing the original ECW .