Complex sentence: Travelers into Metlakatla usually reach it the Alaska Marine Highway ferry or by traveling to Ketchikan, on Revillagigedo Island and crossing the Revillagigedo Channel that separates Annette and Revillagigedo Islands by boat or seaplane.
Split into simpler sentences: Travelers into Metlakatla usually reach it the Alaska Marine Highway ferry. They can also travel to Ketchikan on Revillagigedo Island and cross the Revillagigedo Channel, which separates Annette and Revillagigedo islands, by boat or seaplane.