Complex sentence: The Czechs won the first match of the 2006 FIFA World Cup with 3--0 against the United States, but key players were injured; they lost their next two group matches against Ghana and eventual winners Italy, finishing third in their group.
Split into simpler sentences: The Czechs won the first match of the 2006 World Cup with 3--0 against the United States, but key players were injured. They then lost their next two group matches against Ghana and eventual winners Italy, finishing third in their group.