Complex sentence: The episode, which was animated in stop motion, was inspired by classic TV specials by Rankin/Bass, and is the second "SpongeBob SquarePants" Christmas episode next to "Christmas Who?", which premiered in December 2000.
Split into simpler sentences: The episode, which was animated in stop motion, was inspired by classic TV specials by Rankin/Bass. The special the second "SpongeBob SquarePants" Christmas episode next to "Christmas Who?" which premiered in December 2000.