Explanation:
John's employer sends John several copies of the form W-2 so hat he can for each tax return.
One of the copy of the form that John had filled will be kept by the employer in order to keep record. One copy will be send to authorized tax department for the tax return. While John will keep one copy of the W-2 form with himself for his record for future purpose.
Thus John was sent multiple copies of the W-2 form form his employer.