Complex sentence: The land undulates, between 165m in the southwest, down to 55m in the east, the north border is the 100 to 140m crest of a long range of hills with the popular name, the Hog's Back.
Split into simpler sentences: The land undulates, between 165m in the southwest, down to 55m in the east. The north border is the 100 to 140m crest of a long range of hills with the popular name, the Hog's Back.