Complex sentence: He represented the Azzurri in the 2003 Six Nations and the 2003 World Cup.The tournament saw his international progress set back by a serious thigh injury sustained in the 2004 Six Nations match against Scotland that ruled him out of action for most of the year.
Split into simpler sentences: He represented the Azzurri in the 2003 Six Nations and the 2003 World Cup. His international progress was set back by a serious thigh injury sustained in the 2004 Six Nations match against Scotland which ruled him out of action for most of the year.