Complex sentence: In 1953, Pathet Lao fighters accompanied an invasion of Laos from Vietnam led by Viet Minh forces; they established a government at Samneua in northern Laos.
Split into simpler sentences: In 1953, Pathet Lao fighters accompanied an invasion of Laos from Vietnam led by Viet Minh forces. They established a government at Samneua in northern Laos.