Complex sentence: However, he prefers to recall an event that occurred on Christmas Day, 1969, when he was walking ahead of his unit, acting as "point," and surprised a young North Vietnamese soldier sitting alone on top of an enemy bunker in the jungle.
Split into simpler sentences: However, he rathers to recall an event that occurred on Christmas Day, 1969. He was walking ahead of his unit, acting as "point," when he surprised a young North Vietnamese soldier sitting alone on top of an enemy bunker in the jungle.