Complex sentence: This was probably due to an undocumented leftover from the MOS Technology VIC: by tricking the hardware not to draw the border around the screen, sprited could be moved into this area and displayed.
Split into simpler sentences: This was probably due to an undocumented leftover from the MOS Technology VIC. By tricking the hardware not to draw the border around the screen, sprites could be moved into this area and displayed.