Complex sentence: The transfer roller used in the production of the first postge stamps, (the Penny Black, Two pence blue and the VR Official), was used to transfer the image of the stamp from the master die to the printing plate.
Split into simpler sentences: The transfer roller was used in the production of the first postage stamps, (the Penny Black, Two pence blue and the VR official). It transfered the image of the stamp from the master die to the printing plate.