Complex sentence: Robert Augustine Ward "Doc" Lowndes (September 4,1916-July 14,1998) was an American science fiction author and editor best known as the editor of "Future Science Fiction", "Science Fiction", and "Science Fiction Quarterly".
Split into simpler sentences: Robert Augustine Ward "Doc" Lowndes (September 4,1916-July 14,1998) was an American science fiction author and editor. He was best known as the editor of "Future Science Fiction", "Science Fiction", and "Science Fiction Quarterly".