Complex sentence: There are 2 housing groups: the old Merry lees pit houses of the miners from the mine that was there until the early-1970s, and the private houses on Merry lees Road on the road to Thornton.
Split into simpler sentences: There are 2 housing groups: 1 the old Merry lees pit houses of the miners from the mine that was there until the early 70's 2. The private houses on Merry lees Road on the road to Thornton.