Complex sentence: The game was played in one of the cultural events had more impact in the Basque society, as was the campaign of Euskara "Bai Euskarari" organized by Sustraiak.Months after repeated success in San Sebastian in the mythical stadium Atocha against Bulgaria (4-0).
Split into simpler sentences: The game was played during one of the cultural events that had a large impact in the Basque society, as it was a part of the campaign of Euskara "Bai Euskarari" organized by Sustraiak. Months later, they repeated this success in San Sebastian, in the mythical stadium Atocha against Bulgaria (4-0).