Complex sentence: The camp is difficult to observe due to erosion and local land usage, was roughly diamond shaped, the ditch approximately wide and deep below the turf-line with a rampart of 8 to wide.
Split into simpler sentences: The camp is difficult to observe due to erosion and local land usage. It was roughly diamond shaped, the ditch approximately wide and deep below the turf-line, with a rampart 8 to wide.