Complex sentence: When the body began to decompose, Miyazaki dismembered it, abandoning the torso in a cemetery and the head in a nearby hills while he kept the hands, from which he drank some blood and ate part of them.
Split into simpler sentences: When the body began to decompose, Miyazaki dismembered it, abandoning the torso in a cemetery and the head in the nearby hills. He kept the hands, from which he drank some blood and ate part of them.