Complex sentence: The competition was originally played over two legs, one at each participating club's stadium, but since the 1998 edition, it has been a single match played at a neutral venue, the Stade Louis II in Monaco.
Split into simpler sentences: The competition was originally played over two-legs, one at each participating club's stadium. Since the 1998 competition, the final has been a single match, played at a neutral venue, Stade Louis II in Monaco.