Complex sentence: The British Post Office first issued self-adhesive stamps on October 19,1993, with the introduction of books of 20 First Class stamps, later a 2nd class stamp was introduced, in later years other issues were produced in the self-adhesive format.
Split into simpler sentences: The British Post Office first issued self-adhesive stamps on October 19,1993, with the introduction of books of 20 First Class stamps, later a 2nd class stamp was introduced. In later years other issues were produced in the self-adhesive format.