Complex sentence: Craig Hollis discovers he is immortal and decides to fight crime as Mr. Immortal, but after being shot in the head by a group of thieves realizes that operating alone may not be feasible.
Split into simpler sentences: Craig Hollis discovers he is immortal and decides to fight crime as Mr. Immortal. But after being shot in the head by a group of thieves, he realizes that operating alone may not be feasible.