Original sentence: A number of the claims Hart has made in his books have attracted criticism from other historians and writers, in particular, two incidents discussed in The IRA and its Enemies.Hart has been accused of using unverifiable anonymous interviews in his work, although pro-Irish republican authors, such as Tim Pat Coogan, also use anonymous sources, particularly Irish republican volunteers, whose identities are protected.Hart has written that the incident was a sectarian atrocity and that "these men were shot because they were Protestant".One is the Kilmichael Ambush of November 1920, where Hart has written that the IRA column under Tom Barry killed Auxiliaries when they were wounded or prisoners.The second is the Dunmanway killings, in which ten Protestant men were shot dead (and three disappeared after being taken prisoner by anti-Treaty forces) in April 1922.This claim has been disputed with other writers asserting that the men were targeted for their role as informers to British forces, although the fact that the war was over and an effective amnesty in place cannot be disputed.This has been disputed
Edited sentence: A number of the claims Hart has made in his books have attracted criticism from other historians and writers.Especially controversial is Hart's use of unverifiable anonymous interviews in his work.. The second is the Dunmanway killings, in which ten Protestant men were shot in April 1922.Hart has written that the incident was a sectarian atrocity, "these men were shot because they were Protestant"  Again, this is heavily contested.In particular, two incidents discussed in The IRA and its Enemies have been controversial.One is the Kilmichael Ambush of November 1920, where Hart has written that the IRA column under Tom Barry killed Auxiliaries when they were  wounded or prisoners.Others have written that the men were targeted for their role as informers to British forces.This has been hotly disputed