Complex sentence: In the 1940s he did radio transcriptions which were broadcast nationwide, and by 1942 he had his own stage show traveling coast to coast, "Ramblin'Tommy Scott's Hollywood Hillbilly Jamboree".
Split into simpler sentences: In the 1940s he did radio transcriptions which were broadcast nationwide. By 1942 he had his own stage show traveling coast to coast, "Ramblin'Tommy Scott's Hollywood Hillbilly Jamboree".