What is City / State, when Winner is "Rohan Onslow", and when Circuit is "Oran Park Raceway"?
CREATE TABLE "race_calendar" (
  "circuit" text,
  "city_state" text,
  "date" text,
  "winner" text,
  "team" text
);
SELECT "city_state" FROM "race_calendar" WHERE "winner"='rohan onslow' AND "circuit"='oran park raceway';