Original: The 24th annual WrestleMania event was the first to be held in the state of Florida, and it was only the second WrestleMania to be held outdoors (the first being WrestleMania IX).
Simplified: It was the first WrestleMania to be held in the state of Florida, and the second WrestleMania to be held outdoors the whole time, the other being WrestleMania IX.