Complex sentence: The first episode episode of the American animated television series "SpongeBob SquarePants", it was produced in 1997 and originally aired on Nickelodeon in the United States on May 1,1999, following the television airing of the 1999 Kids' Choice Awards.
Split into simpler sentences: The first episode episode of the American animated television series "SpongeBob SquarePants". It was produced in 1997 and originally aired on Nickelodeon in the United States on May 1,1999, following the television airing of the 1999 Kids' Choice Awards.