Complex sentence: The "greens" succeeded to the finals before the end of the championship and the barrage against Olympiakos, having the certainty that would provide in advance one title and the whistles of the late Anthonios Vassaras where critical for the the final result.
Split into simpler sentences: The "greens" succeeded to the finals before the end of the championship and the barrage against Olympiakos, having the certainty that it would provide them in advance one title. Beside that, the whistles of the late Antonios Vassaras where critical for the the final result.