Complex sentence: Its traditional catchment area is between the nearby towns of Watford and Hemel Hempstead; most students are from Kings Langley and the large neighbouring villages of Bovingdon and Abbots Langley.
Split into simpler sentences: Its traditional catchment area is between the nearby towns of Watford and Hemel Hempstead. Most students are from Kings Langley and around or in the neighbouring villages of Bovingdon, Abbots Langley.