Complex sentence: The original Hellschreiber machine was a mechanical device, so therefore it was possible to send "half-pixels" the right ends of the loops in B, for instance, could be shifted a little, so as to improve the readability.
Split into simpler sentences: The original Hellschreiber machine was a mechanical device, so therefore it was possible to send "half-pixels". The right ends of the loops in B, for instance, could be shifted a little, so as to improve the readability.