Complex sentence: Dil Pickles, who became Tommy's baby brother in "The Rugrats Movie", appears when a player stops on a "Mystery" space, driving the Reptar Wagon and changes the identity of the spaces on the board.
Split into simpler sentences: Dil Pickles, who became Tommy's baby brother in "The Rugrats Movie", has returned on the "Mystery" space. He drives the Reptar Wagon and changes the identity of the spaces on the board.