Complex sentence: Included among them was Lee Falks' comic strip superhero the Phantom, a character who is believed to be immortal but in reality, is descended from twenty previous generations of crime-fighters who all adopt the same persona.
Split into simpler sentences: Included among them was Lee Falks' comic strip superhero, The Phantom a character who is believed to be immortal, as one has existed throughout the generations. In reality, the Phantom is descended from twenty previous generations of crime-fighters who all adopt the same persona.