Original sentence: Extraordinarily, black houses were used as late as the mid 1970's and as people moved into more modern dwellings with conveniences such as running water and central heating, the black house tended to go out of use, and many ruined or roofless examples may be seen
Edited sentence: The black house was used as late as the mid 1970's and as people moved into more modern dwellings with conveniences such as running water and central heating, the black house tended to go out of use, and many ruined or roofless examples may be seen