What's the highest Year Left that's got a Conference Joined of Sagamore with a Year Joined larger than 1942?
CREATE TABLE "former_members" (
  "school" text,
  "location" text,
  "mascot" text,
  "county" text,
  "year_joined" real,
  "year_left" real,
  "conference_joined" text
);
SELECT MAX("year_left") FROM "former_members" WHERE "conference_joined"='sagamore' AND "year_joined">1942;