Complex sentence: He then added shyly that he possessed a power which he used very rarely--the power of reading someone's mind and asked Christine's permission to read her mind to get to know if she was mentally prepared for initiation.
Split into simpler sentences: He then added that he possessed a power which he used very rarely--the power of reading someone's mind. He asked Christine's permission to read her mind to get to know if she was mentally prepared for initiation.