Complex sentence: The town became one of the worst unemployment blackspots in Britain which hit 36 percent in 1981, and the demolition of the works led to a massive hole in the heart of the town.
Split into simpler sentences: The town became one of the worst unemployment blackspots in Britain, and the u8nemplyment figure reached 36 percent in 1981. The demolition of the works carbed a a massive hole in the heart of the town.