Complex sentence: Langenus had established his status as a referee who could be trusted on the big stage at the 1928 Olympic Games when he refereed the first round match in which Uruguay beat the Netherlands and went on to referee the Bronze Medal match in Amsterdam.
Split into simpler sentences: Langenus had established his status as a referee who could be trusted on the big stage at the 1928 Olympic Games when he refereed the first round match in which Uruguay beat the Netherlands. He performed well and went on to referee the Bronze Medal match in Amsterdam.