Complex sentence: At the show, Mr. McMahon unveils the WWE Championship belt, which has been held vacant since Kane's last match was overturned; the title is up for grabs over the weekend at WrestleMania.
Split into simpler sentences: At the show, Mr. McMahon unveils the WWE Championship belt, which has been held vacant since Kane's last match was overturned. The title is up for grabs over the weekend at WrestleMania.