Complex sentence: In 2012, Nickelodeon produced and debuted the eighth season episode "It's a SpongeBob Christmas!"-the first full-length episode in the series to be produced in stop motion animation.
Split into simpler sentences: In 2012, Nickelodeon produced and debuted the eighth season episode "It's a SpongeBob Christmas!". The episode was the first full-length episode in the series that was produced in stop motion animation.