Complex sentence: Every game was umpired by two "international" judges who themselves became household names in the UK Gennaro Olivieri (1922-2009) and Guido Pancaldi (b 1923).
Split into simpler sentences: Every game was umpired by one or two "international" judges. The first judges became household names in the UK Gennaro Olivieri (1922-2009) and Guido Pancaldi (b 1923).