Complex sentence: The roll-out of Universal Credit in the North west of England was limited to new, single, healthy claimants, later extended to couples, then families, in the same area, reflecting the gradual maturing of different aspects of the computer system.
Split into simpler sentences: The roll-out of Universal Credit was limited to new, single, healthy claimants in the North West of England. It was later extended to couples, then families, in the same area, reflecting the gradual maturing of different aspects of the computer system.