Original sentence: Since the introduction of the word genocide in the 1940s by Raphael Lemkin, Lemkin and most other comparative genocide scholars present the extinction of the Tasmanian Aborigines as a text book example of a genocide.The majority of Australian experts don't dispute the events on Tasmania, but they are more circumspect about calling them genocide
Edited sentence: After the introduction of the word genocide in the 1940s by Raphael Lemkin, Lemkin and most other comparative genocide scholars, basing their analysis on previously published histories, present the extinction of the Tasmanian Aborigines as a text book example of a genocide, however the majority of Australian experts are more circumspect,  because more recent detailed studies of the events surrounding the extinction by historians who specialise in Australian history have raised questions about some of the details and interpretations in the earlier histories