Complex sentence: He is a gray Keronian frog with a robot blade arm taking place of his arm that can extend into a blade and has a robot eye in the place of his left eye and his right eye is covered by a metal piece.
Split into simpler sentences: He is a gray Keronian frog with a robot blade arm taking place of his arm, which can extend into a blade. He has a robot eye in the place of his left eye, and his right eye is covered by a metal piece.