Complex sentence: The Gravina Island Bridge proposal, to build a highway bridge across the Tongass Narrows from Revillagigedo Island to Gravina Island, became the subject of national controversy, as critics called the plan a "bridge to nowhere" while attacking its proposed cost of $320 million.
Split into simpler sentences: The Gravina Island Bridge proposal, was a plan to build a highway bridge across the Tongass Narrows from Revillagigedo Island to Gravina Island. It became the subject of national controversy as critics called the plan a "bridge to nowhere" while attacking its proposed cost of $320 million.