Complex sentence: Rock of the Bükkic occur in the north Hungarian mountain Bükk, it consists generally of the Paleozoic shales, carbonats and sandstones but also overlying younger Mesozoic carbonates and volcanic rocks.
Split into simpler sentences: Rock of the Bükkic occurs in the north Hungarian mountain Bükk. It consists generally of the Paleozoic shales, carbonates, and sandstones, but also overlying younger Mesozoic carbonates and volcanic rocks.