what's the occupied territory with operational period of may 1940 – january 1945
CREATE TABLE "table1_10335_1" (
  "camp" text,
  "estimated_deaths" text,
  "operational" text,
  "occupied_territory" text,
  "current_country_of_location" text,
  "primary_means_for_mass_killings" text
);
SELECT "occupied_territory" FROM "table1_10335_1" WHERE "operational"='May 1940 – January 1945';