Complex sentence: Myosai used a pressure point move on him that would kill him in ten days, and promised to remove the effect if Kannei would kill Hakufu but has failed to do this so far.
Split into simpler sentences: Myosai used a pressure point move on him that would kill him in ten days. She promised to remove the effect if Kannei would kill Hakufu but he has failed to do this so far.