Complex sentence: But, in order to do this, he has to obtain the blood of human children, and summons his sidekick, Tonchiki, to follow his legion of Kaiju and clay doll Phantoms (called Maoh-no Teshita) and assist them in his task.
Split into simpler sentences: But, in order to do this, he has to obtain the blood of human children, and summons his sidekick, Tonchiki to assist him. He also uses a legion of Kaiju and clay doll Phantoms (called Maoh-no Teshita) and assist him in his task.