Complex sentence: In 1975, when the U.S. decided to pull out of the Vietnam war, many of Hmongs fled to Thailand, fearing the LPDR would kill them off for supporting the U.S. The persecution still continues to this very day.
Split into simpler sentences: In 1975, when the U.S. decided to pull out of the Vietnam war, many of Hmongs fled to Thailand. Fearing the LPDR would kill them off for supporting the U.S. The persecution still continues to this very day.