Complex sentence: Shank heads back home to find that the Cartels have been replaced by a cruel military regime and his foster family is fighting to oppose the general who is slowly dying have forced him to take an cruel but expedient measure to deal with the cartels.
Split into simpler sentences: Shank heads back home to find that the Cartels have been replaced by a cruel military regime and his foster family is fighting to oppose the general who is slowly dying. These events have forced him to take a cruel but expedient measure to deal with the cartels.