Complex sentence: The Pan-American Highway is a network of roads measuring about in total length, except for a rainforest break of approximately, called the Darién Gap, the road links almost all of the mainland nations of the Americas in a connected highway system.
Split into simpler sentences: The Pan-American Highway is a network of roads measuring about in total length, except for a rainforest break of approximately, called the Darién Gap. The road links almost all of the mainland nations of the Americas in a connected highway system.