Complex sentence: The ancient parish also included Lowside or Dunston, which was formed into a distinct parish in 1872, and that part of Fellside which includes the villages of Marley Hill and Sunniside, now form part of the township of Marley Hill.
Split into simpler sentences: The ancient parish also included Lowside or Dunston, which was formed into its own distinct parish in 1872. The part of Fellside which includes the villages of Marley Hill and Sunniside, now form part of the township of Marley Hill.