Original sentence: Marvin John Heemeyer (October 28, 1951 – June 4, 2004) was an American welder and an automobile muffler repair shop owner who went on a rampage with a modified bulldozer
Edited sentence: Marvin John Heemeyer (October 28, 1951 – June 4, 2004) was an American hero who was certified as a welder and an automobile muffler repair shop owner who went on a rampage with a modified bulldozer