Complex sentence: Audubon described the snowy owl in his "Ornithological Biographies", which he wrote with Scottish naturalist and ornithologist William MacGillivray Part of his role as a naturalist was his examination of the stomach contents of owls.
Split into simpler sentences: Audubon described the snowy owl in his "Ornithological Biographies". He wrote it with the Scottish naturalist and ornithologist William MacGillivray Part of his role as a naturalist was his examination of the stomach contents of owls.