Complex sentence: However, the 1970s proved to be dark times for Argentina, with seven defeats, four draws and only one victory, although it should be mentioned that one of the draws came in the 1978 World Cup played in Argentina.
Split into simpler sentences: However, the 1970s proved to be dark times for Argentina, with 7 defeats, 4 draws and only 1 victory. Although it should be mentioned that one of the draws came in the 1978 FIFA World Cup played in Argentina.