Complex sentence: It was located at the south end of the North Downs, about 100 Númenórean miles north of Bree; after Fornost Erain was abandoned, the site became known as Deadmen's Dike, visited only by Rangers.
Split into simpler sentences: It was located at the south end of the North Downs, about 100 Númenórean miles north of Bree. After Fornost was abandoned, the site became known as Deadmen's Dike, visited only by Rangers.