Complex sentence: He was the author of numerous works associated with Echinoidea, and was an editor of "Paléontologie française", a multi-volume series on French paleontology begun by Alcide Dessalines d'Orbigny in 1840.
Split into simpler sentences: He was the author of numerous works associated with Echinoidea. Also, he was an editor of "Paléontologie française", a multi-volume series on French paleontology begun by Alcide Dessalines d'Orbigny in 1840.