Complex sentence: The power to the conversion unit was cut moments before the conversion process of Gwen Cooper began, finally Lisa Hallett, the'Cyberwoman', used the machine to transplant her brain into the body of a pizza girl.
Split into simpler sentences: The power to the conversion unit was cut moments before the conversion process of Gwen Cooper began. Finally, Lisa Hallett, the'Cyberwoman', used the machine to transplant her brain into the body of a pizza girl.