Complex sentence: The south side of Greystanes features the Lower Prospect Canal Reserve what is simply known by residents as the Canal, which was a water canal once used to transport water from the Prospect Reservoir, but has since been decommissioned and converted into a cycle and walkway.
Split into simpler sentences: The south side of Greystanes features the Lower Prospect Canal Reserve what is simply known by residents as the Canal. Originally it was a water canal once used to transport water from the Prospect Reservoir, but has since been decommissioned and converted into a cycle and walkway.