Complex sentence: Kristian Prestgard (29 April 1866--25 January 1946) was a Norwegian-born, American author and the editor of the Norwegian language newspaper "Decorah-Posten" in Iowa from 1923 until 1946.
Split into simpler sentences: Kristian Prestgard (29 April 1866--25 January 1946) was a Norwegian-born, American journalist and author. He served as the editor of the Norwegian language newspaper "Decorah-Posten" in Iowa from 1923 until 1946.