Complex sentence: Stephen McDannell Hillenburg (born August 21,1961) is an American marine biologist, cartoonist, animator, director, producer, writer, and voice actor, who is best known for creating the Nickelodeon animated television series "SpongeBob SquarePants".
Split into simpler sentences: Stephen McDannell Hillenburg (born August 21,1961) is an American marine biologist, animator, director, producer, writer, cartoonist, and voice actor. Although associated with several animated television series, he is best known for creating the Nickelodeon animated series "SpongeBob SquarePants".