Complex sentence: In the year 1602 in the Marvel Universe, for an unknown reason, superheroes have appeared about 400 years early, though they were born and bred in this era and some hold important positions in high places.
Split into simpler sentences: In the year 1602 in the Marvel Universe, for an unknown reason, superheroes have appeared about 400 years early. They were born and bred in this era and some hold important positions in high places.