Complex sentence: "Refuge Rock" is a large area of sandstone rock in the bushland to the west, used for training of soldiers prior to WWII; bushwalkers can observe blast marks from mortar fire in the sandstone.
Split into simpler sentences: Refuge Rock, a large area of sandstone rock in the bushland, to the west. Used for training of soldiers prior to WWII, bushwalkers can observe blast marks from mortar fire in the sandstone.