What is the date for the MF position and player Jennison Myrie-Williams?
CREATE TABLE "loan_in" (
  "date_from" text,
  "date_to" text,
  "position" text,
  "name" text,
  "from" text
);
SELECT "date_from" FROM "loan_in" WHERE "position"='mf' AND "name"='jennison myrie-williams';