Original sentence: Amnesty International estimates the total death toll as 1.4 million.Former Khmer Rouge leader Pol Pot gave a figure of 800,000, and his deputy, Khieu Samphan, said 1 million had been killed.In the early 1980s, the Vietnamese-installed regime that succeeded the Khmer Rouge conducted a national household survey, which concluded that over 3.3 million had died, but most modern historians do not consider that number to be reliable.Modern research has located thousands of mass graves from the Khmer Rouge era all over Cambodia, containing an estimated 1.39 million bodies.The exact number of people who died as a result of the Khmer Rouge's policies is debated, as is the cause of death among those who died.Various studies have estimated the death toll at between 740,000 and 3,000,000, most commonly between 1.4 million and 2.2 million, with perhaps half of those deaths being due to executions, and the rest from starvation and disease
Edited sentence: Amnesty International gives estimates of the total death toll as 1.4 million.Contemporary estimates of executions range from 250,000 to 1,500,000.Former Khmer Rouge leader Pol Pot gave a figure of 800,000.Khieu Samphan said 1 million had been killed.Neither CIA reports nor Vietnamese claims are considered credible sources by modern historians.The Vietnamese-installed regime that succeeded the Khmer Rouge claimed that 3.3 million had died.The exact number of people who died as a result of the Khmer Rouge's policies is debated as is the cause of death among those who died.While modern research has located mass graves from the Khmer Rouge era all over Cambodia, the causes of death of the people in the graves is open to dispute and interpretation