Complex sentence: A separation barrier is a barrier (such as a defensive wall, fence, mound, trench or minefield) intended to restrict the movement of people across a certain line, typically a demarcation line or a border, or to physically separate peoples or cultures.
Split into simpler sentences: A separation barrier is a barrier (such as a defensive wall, fence, mound, trench or minefield). Such barriers are constructed to restrict the movement of people across a certain line, typically a demarcation line or a border, or to physically separate peoples or cultures.