Original sentence: Following the independence of the the Indochina states, North Vietnamese attempts to conquer South Vietnam resulted in the Vietnam War.The conflict spread to Laos and Cambodia and heavy intervention from the United States.The victory of the Khmer Rouge in Cambodia resulted in the Cambodian Genocide
Edited sentence: Recent evidence from the US National Security Archive published by George Washington University suggests this massacre was carried out with the support of the United States embassy in Jakarta, which supplied lists of names of suspected PKI members to Suharto.The United States intervention against communist forces in Indochina during a conflict commonly referred to in the United States as the Vietnam War meant that Vietnam, Laos and Cambodia had to go through a prolonged and protracted war in their route to independence