Complex sentence: Another locality nearby called "Hartesborch" was first mentioned in a 1314 deed by Ilsenburg's Benedectine abbey and the town itself, then called "Neustadt" ("new town"), was mentioned in 1338.
Split into simpler sentences: Another locality nearby named "Hartesborch" was first mentioned in a 1314 deed by the Benedectine abbey of Ilsenburg. The present-day town itself, then called "Neustadt" ("new town"), was first documented in 1338.