Complex sentence: Iron Man 2020 (real name Arno Stark) is a fictional character and supervillain who exists in the future year of 2020 within the Marvel Comics multiverse.
Split into simpler sentences: Iron Man 2020 (real name Arno Stark) is a fictional supervillain. He is the counterpart of the superhero Iron Man in the future year of 2020 in the Marvel Comics multiverse.