Complex sentence: On the Cybermen's adopted homeworld of Telos, two slaves named Bates and Stratton escape from their work party and decapitate a Cyberman so that they can use its helmet to disguise Stratton as a Cyberman and enter Cyber Control.
Split into simpler sentences: On the Cybermen's adopted homeworld of Telos, two slaves, Bates and Stratton, escape from their work party and decapitate a Cyberman. They use its helmet to disguise Stratton as a Cyberman and enter Cyber Control.