Complex sentence: The postal administration of the order was instituted on 20 May 1966 under a Decree of the Grand Master of the order and the first stamps were issued on 15 November 1966.
Split into simpler sentences: The postal administration of the order was instituted on 20 May 1966 under a Decree of the Grand Master of the order. The first stamps of the order were issued on 15 November 1966.