Complex sentence: It was the last production by Shotaro Ishinomori, released posthumously, who intended for the series to be serious, while it was originally written to be a parody of older tokusatsu programs.
Split into simpler sentences: It was the last production by Shotaro Ishinomori, released posthumously. He intended for the series to be serious, while it was originally written to be a parody of older tokusatsu programs.