Complex sentence: The legacy of the town's industrial past remains visible in its landscape of red-brick cotton mills, now used as warehouses or distribution centres, some of which are listed buildings because of their architectural, historical, and cultural significance.
Split into simpler sentences: The legacy of the town's industrial past remains visible in its landscape of red-brick cotton mills, now used as warehouses or distribution centres. Some of these are listed buildings because of their architectural, historical, and cultural significance.