Complex sentence: His late biological father, Dr. Azuma, was the inventor of the robots that were originally intended to serve humankind, but mutinied en masse when their cold logic concluded that the good of the Earth Ecosystem required the destruction of the human race.
Split into simpler sentences: His late biological father, Dr. Azuma, was the inventor of the robots that were originally intended to serve humankind. However the robots mutinied en masse when their cold logic concluded that the good of the Earth Ecosystem required the destruction of the human race.