Complex sentence: In the episode "The Ultron Outbreak", Arsenal briefly regains control of his (and Ultron's) body to say goodbye to Iron Man before once again sacrificing himself by flying into the sun, seemingly getting rid of Ultron in the process.
Split into simpler sentences: In the episode "The Ultron Outbreak", Arsenal briefly regains control of his (and Ultron's) body to say goodbye to Iron Man. Arsenal then sacrifices himself once again by flying into the sun, seemingly getting rid of Ultron in the process.