Complex sentence: Christian Parenti argues in his book "Lockdown America" that prison gangs serve a convenient function for the prison establishment and officers: they help regulate rogue and rebellious elements within the prison population without intervention from prison authorities.
Split into simpler sentences: Christian Parenti argues in his book "Lockdown America" that prison gangs serve a convenient function for the prison establishment and officers. They help regulate rogue and rebellious elements within the prison population without intervention from prison authorities.