Complex sentence: Older terminology for what is currently known as a banner is "the race", named after the caged wire tunnel separating players from patrons that the players traverse to enter the playing arena known as "the race" or "the players race".
Split into simpler sentences: Older terminology for what is currently known as a banner is "the race", named after the caged wire tunnel separating players from patrons that the players traverse to enter the playing arena. This tunnel is known as "the race" or "the players race".