Complex sentence: During the Vietnamese invasion in 1978, the Cambodian aircraft were reluctant to take-off to intercept the Vietnamese ones, thus the Vietnamese captured a number of J-6s and put them on public display.
Split into simpler sentences: During the Vietnamese invasion in 1978, the Cambodian aircraft were reluctant to take-off to intercept the Vietnamese aircraft. The Vietnamese captured a number of J-6s and put them on public display.