Complex sentence: In the 1930s and 1940s, Chesterfield sponsored a popular radio program, the "Chesterfield Hour", which featured big bands such as those of Paul Whiteman, Glenn Miller and Harry James.
Split into simpler sentences: In the 1930s and 1940s, Chesterfield sponsored popular radio programs. The "Chesterfield Hour" featured big bands such as those of Paul Whiteman, Glenn Miller and Harry James.