Complex sentence: Some recurring themes in the comic include people being stranded on desert islands, aliens, heaven, hell, the life of cavemen, and many cartoons focused on animals, especially cows, dogs, flies and ducks.
Split into simpler sentences: Some recurring themes in the comic include people being stranded on desert islands, aliens, heaven, hell and the life of cavemen. Many cartoons focused on animals, especially cows, dogs, flies and ducks.