Complex sentence: The mei is chiseled onto the tang on the side which traditionally faces away from the wearer's body while being worn; since the katana and wakizashi are always worn with the cutting-edge up, the edge should be held to the viewer's left.
Split into simpler sentences: The mei is chiseled on to the tang on the side which traditionally faces away from the wearer's body while being worn. Since the katana and wakizashi are always worn with the cutting-edge up, the edge should be held to the viewer's left.