Complex sentence: Some buildings such as Bank Hall in Bretherton have a voluntary group to help save them, whereas other buildings such as Greaves Hall in Banks just a few miles away, became beyond repair in August 2009 due to vandalism, was de-listed and is now demolished.
Split into simpler sentences: Some buildings such as Bank Hall in Bretherton have a voluntary group to help save them. Where as other buildings such as Greaves Hall in Banks just a few miles away, became beyond repair in August 2009 due to vandalism and had been de-listed and is now demolished.