Complex sentence: By the age of 20, he already had a following when he expanded his repertoire to include clownish animals, and his cartoons soon appeared daily as "In Jungle Land", or occasionally, "In Jungle Society".
Split into simpler sentences: By the age of 20, he already had a following when he expanded his repertoire to include clownish animals. His funnies soon appeared as dailies with the title "In Jungle Land", or occasionally, "In Jungle Society".