What is Winner, when Team is "R.J.MacArthur Onslow", and when Circuit is "Oran Park Raceway"?
CREATE TABLE "race_calendar" (
  "circuit" text,
  "city_state" text,
  "date" text,
  "winner" text,
  "team" text
);
SELECT "winner" FROM "race_calendar" WHERE "team"='r.j.macarthur onslow' AND "circuit"='oran park raceway';