Complex sentence: Altrincham Sewage Farm, visible on the map above, was used to flood the surrounding fields with sewage water, and to the west a series of disused marl-pits formed the Timperley Sewage Beds, a further source of manure.
Split into simpler sentences: Altrincham Sewage Farm (visible on the above map) was used to flood the surrounding fields with sewage water. To the west, a series of disused marl-pits formed Timperley Sewage Beds, a further source of manure.