Complex sentence: The game ended with 3--0 defeat, the tenth in the league, matching the record of 1996--97, which caused the club to be overtaken by Belenenses in the league table.
Split into simpler sentences: The game ended in a 3--0 defeat--their tenth loss within the league, matching their previous record in the 1996--97 season. As a result, the club was overtaken by Belenenses in the league table.