Complex sentence: James McBratney lead the gang from Manhattan's West Side, after trying to lower the ransom the Gambino family, to their horror, found after months of negotiations that Manny had been killed.
Split into simpler sentences: James McBratney lead the gang from Manhattan's West Side. After trying to lower the ransom, the Gambino family, to their horror, found after months of negotiations that Manny had been killed.