Simplify the following text for a Grade 9 native English-speaking person.
Original: His first televised pay-per-view appearance was at World War 3 where he competed in the 3-ring , 60-man World War 3 battle royal for the vacant WCW World Heavyweight Championship .
Simplified: At World War 3 he competed in the 3-ring , 60-man World War 3 battle royal for the vacant WCW World Heavyweight Championship .