Complex sentence: He is known for having refereed one match in the 1998 FIFA World Cup in France, the Group C match between Denmark and South Africa, during which he handed out seven yellow cards and three reds, most of which were widely regarded as without merit.
Split into simpler sentences: He is known for having refereed one match in the 1998 FIFA World Cup in France. The match was between Denmark and South Africa during which he handed out seven yellow cards and three reds, most of which were widely regarded as without merit.