Complex sentence: The most significant of these was the causeway and truss bridge that crossed the mouth of the Jacob River estuary in Riverton, and although it stood into the 21st century, it has now been removed, with one truss preserved by a local museum.
Split into simpler sentences: The most significant of these was the causeway and truss bridge that crossed the mouth of the Jacob River estuary in Riverton. The bridge was removed in the 21st century, with one truss preserved by a local museum.