{Gohyakukiroguramuno uma / *uma gohyakukiroguramu}ga kyoono reesude hashirurasii .
{5-100 CL-no horse / horse 5-100 CL}-NOM today-no race-at run-PRES-seems
It seems that {(a) 500 kilogram horse(s) / 500 kilograms of horse} are running in today’s race.