Complex sentence: Louis Francis Burns (January 2,1920--May 20,2012) (Osage) was an American historian, author, and teacher, a leading expert on the history, mythology and culture of the Osage Nation.
Split into simpler sentences: Louis Francis Burns (January 2,1920--May 20,2012) was an American tribal historian, author, and teacher. He was a leading expert on the history, mythology and culture of the Osage Nation.