Complex sentence: The name "Dolomites" is derived from the famous French mineralogist Déodat Gratet de Dolomieu who was the first to describe the rock, dolomite, a type of carbonate rock which is responsible for the characteristic shapes and colour of these mountains.
Split into simpler sentences: The name "Dolomites" is derived from the famous French mineralogist Déodat Gratet de Dolomieu who was the first to describe the rock. This coral stone is responsible for the characteristic shapes and colour of these mountains.