Complex sentence: Duncansby Head (grid reference) is the most north-eaasterly part of the Scottish mainland, including the famous John o' Groats, Caithness, Highland.
Split into simpler sentences: Duncansby Head (grid reference) is the most north-eaasterly part of the Scottish mainland. It is more north-easterly than the famous John o' Groats, Caithness, Highland.