Complex sentence: Both Hochschild and the Congolese historian Georges Nzongola-Ntalaja have both argued that the atrocities did not constitute a genocide because they did not meet the UN definition and there is no evidence of any deliberate intent to exterminate particular ethnic groups.
Split into simpler sentences: Both Hochschild and the Congolese historian Georges Nzongola-Ntalaja have both rejected the assertion that the atrocities constituted a genocide because they did not meet the UN definition. They agree that there is no evidence of any deliberate intent to exterminate particular ethnic groups.