Complex sentence: He only managed to net one official goal, in an international against San Marino in February 2005; in 2005--06, he played 43 games and scored six goals (four in the league and two in European competition).
Split into simpler sentences: He only managed to net one official goal, in an international against San Marino in February 2005. In 2005--06, he played 43 games and scored six goals (four in the league and two in European competition).