Complex sentence: Scott's Grotto is a series of interconnected chambers, extending some 67 ft into the chalk hillside on the outskirts of Ware, Hertfordshire; built during the late 18th century, the chambers and tunnels are lined with shells, flints and pieces of coloured glass.
Split into simpler sentences: Scott's Grotto is a series of interconnected chambers, extending 67 ft into the chalk hillside on the outskirts of Ware, Hertfordshire. Built during the late 18th century, the chambers and tunnels are lined with shells, flints and pieces of coloured glass.