Complex sentence: ABC regulations permit a bar owner or employee to give away a free drink as long as it is not advertised, allow businesses to issue free or complimentary drink coupons (up to one per day per patron).
Split into simpler sentences: ABC regulations permit a bar owner or employee to give away a free drink as long as it is not advertised. Businesses may issue free or complimentary drink coupons (up to one per day per patron).