Complex sentence: Kirkby Stephen is a small market town in Cumbria, in North West England which historially, is part of Westmorland (whose name is preserved by the neighbouring town, Appleby-in-Westmorland which is 12 miles (19 km) to the north west).
Split into simpler sentences: Kirkby Stephen is a small market town in Cumbria, in North West England. Historially part of Westmorland, (whose name is preserved by the neighbouring town, Appleby-in-Westmorland, 12 miles (19 km) to the north west).