Complex sentence: Warden had his first credited film role in "The Man with My Face" in 1951, and in 1952 he began a three-year role in the television series "Mr. Peepers".
Split into simpler sentences: Warden had his first credited film role in "Man with My Face" in 1951. In 1952, he began a three year role in the television series "Mr. Peepers".