Complex sentence: In addition to his onscreen work, Nelson was an in-demand voiceover artist for animated cartoons, appearing on "The Flintstones", "The Jetsons" and as Governor Wetworth on "The Snorks" among other programs.
Split into simpler sentences: In addition to his onscreen work, Nelson was an in-demand voiceover artist for animated cartoons. In television cartoons, he worked on "The Flintstones", "The Jetsons" and as Governor Wetworth on "The Snorks" among other programs.