Original sentence: "  He was eventually pronounced insane, making him immune to criminal prosecution, and he was incarcerated in a unit for the criminally insane.Howard Unruh (born January 21, 1921) is a World War Two veteran and American mass murderer, and is regarded as one of the first of the 'lone gunmen' to go on an indiscriminate shooting spree, an event that became more common in the latter half of the Twentieth Century and beyond
Edited sentence: "  He was eventually pronounced insane, making him immune to criminal prosecution, and he was incacerated in a unit for the criminally insane.Howard Unruh (born January 21, 1921) is a World War Two veteran and American mass murderer, and is regarded as one of the first of the 'lone gunmen' to go on an indiscriminate shooting spree, an event that became more tragically common in the latter half of the Twentieth Century and beyond