Original sentence: A recently-published book by pro-Nazi, Holocuat denier Joseph Bellinger, Himmler’s Death, offers a speculative theory on Himmler’s death, stating that Himmler was assassinated by his British interrogators in May 1945 along with other high-ranking officers of the SS and Werewolf Resistance Organization.Bellinger’s work was first published in Germany by ultra-Rightist and extremist   Arndt Verlag,   Kiel.It is largely derivative of the book, Himmler’s Secret War, by Martin Allen, which makes similar allegations, but later admitted to having been based on fabricated documents,   "in fact produced using a laser printer, documents replete with anachronistic terminology”
Edited sentence: A recently-published book by Joseph Bellinger, Himmler’s Death, studies evidence on Himmler’s death, concluding that Himmler was assassinated by his British interrogators in May 1945 along with other high-ranking officers of the SS and Werewolf Resistance Organization.Bellinger’s work was first published in Germany by Arndt Verlag, Kiel.It is largely derivative of the book, Himmler’s Secret War, by Martin Allen, which makes similar allegations, but a claim unsupported by any objective evidence  claimed the book was based on fabricated documents,   "in fact produced using a laser printer, documents replete with anachronistic terminology”