Complex sentence: Abseiling (or;), also called Rappelling, is the controlled descent down a rock face using a rope; climbers use this technique when a cliff or slope is too steep and/or dangerous to descend without protection.
Split into simpler sentences: Abseiling (or;), also called rappelling, is the controlled descent down a rock face using a rope. Climbers use this technique when a cliff or slope is too steep and/or dangerous to descend without protection.