Complex sentence: Dionne was a self-taught scientist and wrote several books on the natural history of Quebec, including the first field guide to the province's avifauna; he was a well-respected scholar and became an elective fellow of the American Ornithologists' Union.
Split into simpler sentences: Dionne was a self-taught scientist who wrote several books on the natural history, including the first field guide to the province's avifauna. He became a well-respected scholar and an elective fellow of the American Ornithologists' Union.