Complex sentence: A variation on this is called the "Egyptian Bow Drill", which attaches the string by wrapping it around multiple times, or actually tying it to the drill or through a hole through the drill shaft, then wrapping it.
Split into simpler sentences: A variation on this is called the "Egyptian Bow Drill". It attaches the string by wrapping it around multiple times, or actually tying it to the drill or through a hole through the drill shaft, then wrapping it.