Complex sentence: Focusing on the Mexican Mafia prison gang, Skarbek argues that mafia holds substantial control within local jail systems which allows it to yield power over drug dealers on the street who anticipate future incarceration and thus future interaction with the mafia.
Split into simpler sentences: Focusing on the Mexican Mafia prison gang, Skarbek argues that the mafia holds substantial control within local jail systems which allows it to yield power over drug dealers on the streets. Drug dealers outside the prison walls, anticipate future incarceration and thus future interaction with the mafia.