Complex sentence: Hikawa does not get up, but simply talks, his head lying down, not facing anything, of how Yumi was abandonned by her parents, and God, left only with him, but he was unable to help her.
Split into simpler sentences: Hikawa does not get up, but simply talks, his head lying down, not facing anything, of how Yumi was abandoned by her parents, and God. She was left only with him, but he was unable to help her.