Complex sentence: There is a small (by) turf covered islet known as the Groundwater of Holm just off the eastern shore of the loch which has ruins of an oval structure and small projecting pier.
Split into simpler sentences: There is a small (by) turf covered islet known as the Groundwater of Holm just off the eastern shore of the loch. It shows traces in stone of an oval structure and small projecting pier.