Complex sentence: Due to the cartridge's space limitations, full motion video was not usually feasible for use in cut scenes; when it was present, it was compressed to fit on the cartridge, extremely pixelated, and usually of very brief length.
Split into simpler sentences: Due to the cartridge's space limitations, full motion video was not usually feasible for use in cutscenes. When it was present, it was compressed to fit on the cartridge, extremely pixelated, and usually of very brief length.