Complex sentence: After Weaver signed on in 1946 as a member of Spike Jones'City Slickers band, he was heard on Jones' 1947-49 radio shows, where he introduced his comedic Professor Feitelbaum, a character who spoke in Spoonerisms.
Split into simpler sentences: After Weaver signed on in 1946 as a member of Spike Jones'City Slickers band. Weaver was heard on Jones' 1947-49 radio shows, where he introduced his comedic Professor Feitelbaum, a character who spoke in Spoonerisms.