Complex sentence: The Black Hand was a criminal tactic used by gangsters based in major cities, in the United States, in Chicago Black Hand extortion began around 1900 and had all but faded away by 1920.
Split into simpler sentences: The Black Hand was a criminal tactic used by gangsters based in major cities, in the United States. In Chicago Black Hand extortion began around 1900 and had all but faded away by 1920.