Complex sentence: The Tsankov Kamak dam which is the first double curvature arch dam in cupola shape, of maximum dam height of, in Bulgaria is the second in the cascade series from the upstream end, and the last to be developed.
Split into simpler sentences: The Tsankov Kamak dam is the first double curvature arch dam in cupola shape in Bulgaria. It is the second in the cascade series from the upstream end, and the last to be developed.