When did acharya shree koshalendraprasadji maharaj become acharya?
CREATE TABLE "acharyas" (
  "acharya_number" real,
  "name_of_acharya" text,
  "born_on" text,
  "became_acharya_on" text,
  "death" text,
  "term" text
);
SELECT "became_acharya_on" FROM "acharyas" WHERE "name_of_acharya"='acharya shree koshalendraprasadji maharaj';