Complex sentence: He played as a defender on the right side, and sporadically on the other flank; his professional career was closely connected to Real Sociedad, where he played 13 of 15 total seasons.
Split into simpler sentences: He played as a defender on the right side, and sporadically on the other flank. His professional career was closely connected to Real Sociedad, where he played 13 of 15 total seasons.