Complex sentence: Drumanargh is nearly 900 m. long and 190 m. wide, consisting of a peninsula defended by three rows of parallel ditches on the landward side, the site appears to have been a port or bridgehead.
Split into simpler sentences: Drumanargh is nearly 900 m. long and 190 m. wide, consisting of a small peninsula defended by three rows of parallel ditches on the landward side. The site appears to have been a port or bridgehead.