Complex sentence: To stop the threat of Barbas or anyone else possessing Cole's powers, Paige strips Barbas of his powers and Cole takes them back; the sisters, however, fear that his powers will make him evil again.
Split into simpler sentences: To stop the threat of Barbas or anyone else possessing Cole's powers, Paige strips Barbas of Cole's powers and Cole takes them back. The sisters, however, fear that these abilities will make him evil again.