Complex sentence: After several weeks of trying to push the boulder off, her loyal henchman Klungo decides that a different plan of action is required: he builds a Gruntilda-shaped robot, Mecha-Grunty, into which Gruntilda's spirit transfers.
Split into simpler sentences: After several weeks of trying to push the boulder off, her loyal henchman Klungo decides that a different plan of action is required. He builds a mechanical robot, Mecha-Grunty, into which Gruntilda's spirit transfers.