Complex sentence: Evilhawk was unable to use a healing power like Darkhawk's because his original body had been destroyed; when his Evilhawk android body was destroyed, he existed only as a disembodied consciousness kept in check by Osch.
Split into simpler sentences: Evilhawk was unable to use a healing power like Darkhawk's because his original body had been destroyed. When his Evilhawk android body was destroyed, he existed only as a disembodied consciousness kept in check by Osch.