Complex sentence: His first game came on 10 September 1995, playing three minutes of a 3--0 home win against Sporting de Gijón; he went on to play 11 seasons at Sociedad, all of them in the first division.
Split into simpler sentences: His first game came on 10 September 1995, playing three minutes of a 3--0 home win against Sporting de Gijón. He remained 11 seasons at Sociedad, all of them in the first division.