Complex sentence: Colson has worked to promote prisoner rehabilitation and reform of the prison system in the United States, citing his disdain for what he calls the "lock'em and leave' em" warehousing approach to criminal justice.
Split into simpler sentences: Colson has worked to promote prisoner rehabilitation and reform of the prison system in the United States. He disdains what he calls the "lock'em and leave' em" warehousing approach to criminal justice.