Complex sentence: Andre attempts to reverse the process to return himself to normal, but fails and when he realiszes that his mind is being overtaken by that of the fly he asks his wife to end his suffering by killing him with a heavy machine press.
Split into simpler sentences: Andre attempts to reverse the process to return himself to normal, but fails. When he realizes that his mind is being overtaken by that of the fly he asks his wife to end his suffering by killing him with a heavy machine press.