Complex sentence: The biggest game of his life was against South Africa, on July 19,1965, in the Ellis Park Stadium, the Argentine team had played against Springboks, in the historic victory of Argentina by 11-6.
Split into simpler sentences: The biggest game of his life was against South Africa. On July 19,1965, in the Ellis Park Stadium, the Argentine team had played against Springboks, in the historic victory of Argentina by 11-6.