Complex sentence: The ferry system has been in the spotlight in recent years over a proposal to build a road link between Skagway and Juneau, the only mainland state capital in the United States without road access.
Split into simpler sentences: The ferry system has been in the spotlight in recent years over road proposals. A road has been proposed to link Skagway, which is hooked up to the road system, and Juneau, the only capital in the United States currently without road access.