Complex sentence: In "The Mutation Situation," Kirby has been having recurring nightmares about the Kraang, which ends up helping the Turtles track down a Kraang stealth ship carrying a shipment of mutagen.
Split into simpler sentences: In "The Mutation Situation," Kirby has been having recurring nightmares about the Kraang. Kirby ends up helping the Turtles track down a Kraang stealth ship carrying a shipment of mutagen.