Complex sentence: TOSLINK cables do not work well (and may even suffer permanent damage) if tightly bent or squashed by, say, a misplaced foot, and their high light-signal attenuation limits their effective range to or so.
Split into simpler sentences: TOSLINK cables do not work well (and may even suffer permanent damage) if tightly bent or squashed by, say, a misplaced foot. Their high light-signal attenuation limits their effective range to or so.