Complex sentence: This type of bridge does not appear in any other part of the world, and has disappeared from China several hundred years ago.900 years later in 1980's several dozens of ancient timber arch bridges were discovered in the mountain area of south Zhejiang and north Fujian Provinces.
Split into simpler sentences: This type of bridge does not appear in any other part of the world and was thought to have disappeared from China several hundred years ago. Nine hundred years later, in 1980's, several dozens of ancient timber arch bridges were discovered in the mountain area of south Zhejiang and north Fujian Provinces.