Complex sentence: A man's body and spirit are taken and used as part of a devil castle, and become a Cyber Ninja, which teams up with the chi pupils whose cyber-earmuffs show a matching red icon.
Split into simpler sentences: A man's body and spirit are taken and used as part of a devil castle and becomes a Cyber Ninja. He teams up with the chi pupils whose cyber-earmuffs show a matching red icon.