Original: WrestleMania XX was the third WrestleMania at Madison Square Garden but the fourth to take place in the New York metropolitan area (following WrestleMania I, WrestleMania 2, and WrestleMania X).
Simplified: The event was the third WrestleMania at Madison Square Garden, but the fourth to take place in the New York metropolitan area (after WrestleMania I, WrestleMania 2, and WrestleMania X).