Simplify the following text for a Grade 13 native English-speaking person.
Original: Time-Warner owned professional wrestling company World Championship Wrestling set up in the building for the Inaugural edition of WCW Monday Nitro - also the WCW debut of Lex Luger , under his `` The Narcissist '' gimmick .
Simplified: Time Warner-owned professional wrestling company World Championship Wrestling came into the building to set up for the inaugural edition of WCW Monday Nitro - which also saw the WCW debut of Lex Luger .