Complex sentence: The island is connected to the mainland via an undersea tunnel (Norway's first such structure); the town's airport, Vardø Airport, Svartnes, and the settlement of Svartnes are located on the mainland opposite the tunnel entrance.
Split into simpler sentences: The island is connected to the mainland via an undersea tunnel (Norway's first such structure). The town's airport, Vardø Airport, Svartnes, and the settlement of Svartnes are located on the mainland opposite the tunnel entrance.