Complex sentence: However, the line from Hurleston to Llangollen was retained purely as a water feeder for the Shropshire Union Canal main line and for drinking water, with an agreement in 1955 with the Mid & South East Cheshire Water Board securing the line's future.
Split into simpler sentences: However, the canal from Hurleston to Llangollen was retained as a water feeder for the Shropshire Union Canal main line and for drinking water. In 1955 an agreement with the Mid & South East Cheshire Water Board secured the canal's future.