Original sentence: Sino-Indian War of 1967 started on 11 September 1967, when China's People's Liberation Army (PLA) launched an attack on Indian posts at Nathu La, and lasted till 15 September 1967
Edited sentence: Sino-Indian War of 1967 started on 11 September 1967, when China's People's Liberation Army (PLA) launched an attack on Indian posts at Nathu La, China did this to take the state of Sikkim from the Republic of India and lasted till 15 September 1967