Simplify the following text for a Grade 10 native English-speaking person.
Original: Jericho is a six-time world champion , having won the WCW World Heavyweight Championship twice , the aforementioned Undisputed Championship , and the World Heavyweight Championship three times .
Simplified: He is a six-time world champion , having won the WCW\/World Championship twice , the WWF Championship once , and the World Heavyweight Championship three times .