Complex sentence: Like the Nor Loch, this was mostly marshland, rather than a true loch, and was also reclaimed for similar purposes, i.e. a park, housing and to build the railway to the Forth Bridge.
Split into simpler sentences: Like the Nor Loch, this was mostly marshland, rather than a true loch. It was reclaimed for a park, housing and to build the railway to the Forth Bridge.