Complex sentence: The Royal Australian Navy Bridging Train was a unique unit of the Royal Australian Navy, active only during the First World War, where it served in the Gallipoli and the Sinai and Palestine Campaigns.
Split into simpler sentences: The Royal Australian Navy Bridging Train was a unique unit of the Royal Australian Navy. It was active only during the First World War, where it served in the Gallipoli and the Sinai and Palestine Campaigns.