Complex sentence: In the 1950s and' 60s, Knudsen appeared in guest starring roles on several television shows including "Alfred Hitchcock Presents", "The Millionaire", "Perry Mason", and "Pete and Gladys".
Split into simpler sentences: In the 1950s and' 60s, Knudsen appeared in guest starring roles on several television shows. Other television appearances included "Alfred Hitchcock Presents", "The Millionaire", and "Pete and Gladys".