Complex sentence: The cost of the item of stationery included the manufacture of the item and the charge for postal service and the design of imprinted stamps often bears a close resemblance to normal adhesive stamps of the same county and era.
Split into simpler sentences: The cost of the item of stationery included the manufacture of the item and the charge for postal service. The design of imprinted stamps often bears a close resemblance to normal adhesive stamps of the same county and era.