Complex sentence: Fossils found on the Chatham Islands characterize the flora and fauna of the Chatham Rise in the late Mesozoic; it had forests dominated by gymnosperms (such as "Araucaria", "Mataia" and "Podocarpus") and Lycopodiopsida (clubmosses).
Split into simpler sentences: Fossils found on the Chatham Islands characterize the flora and fauna of the Chatham Rise in the late Mesozoic. The region had forests dominated by gymnosperms (such as "Araucaria", "Mataia" and "Podocarpus") and Lycopodiopsida (clubmosses).