Original sentence: Douglas Ellison—mayor of Medora, North Dakota, and an amateur historian—also wrote a book in support of the veracity of Finkel's claim.Frank Finkel, from Dayton, Washington, had such a convincing story that historian Charles Kuhlman  believed the alleged survivor, going so far as to write a lengthy defense of Finkel's participation in the battle
Edited sentence: Another amateur historian, Douglas Ellison, Mayor of Medora, North Dakota, wrote a book in support of the veracity of Finkel's claim.Frank Finkel, from Dayton, Washington had such a convincing story that Charles Kuhlman, a farmer who had been a professor of European history for a year at the University of Nebraska,  believed the alleged survivor, going so far as to write a lengthy defense of Finkel's participation in the battle