How many debut years have Years at club of 1950–1951, and Games larger than 14?
CREATE TABLE "1950s" (
  "debut_year" real,
  "player" text,
  "games" real,
  "goals" real,
  "years_at_club" text
);
SELECT SUM("debut_year") FROM "1950s" WHERE "years_at_club"='1950–1951' AND "games">14;