Complex sentence: The term has been used since at least as early as 1683 when, with a publication of that year stating that "The scabbards mentioned in printers' grammars of the last century were of cardboard or millboard".
Split into simpler sentences: The term has been used since at least as early as 1683. With a publication of that year stating that "The scabbards mentioned in printers' grammars of the last century were of cardboard or millboard".