Complex sentence: They are followed by Henry and his friends Victor Criss and Belch Huggins, who threaten Stan, only for It to kill Victor and Belch, but spares the terrified Henry, whose hair turns white.
Split into simpler sentences: They are followed by Henry and his friends Victor Criss and Belch Huggins, who threaten Stan. It kills Victor and Belch, but spares the terrified Henry, whose hair turns white.