Complex sentence: The social and political turmoil in Cambodia led him to leave in the 1980s and he settled in the United States where his interest in the arts continued from his time at admiring artwork in his native temples.
Split into simpler sentences: The social and political turmoil in Cambodia led him to leave in the 1980s and he settled in the United States. His interest in the arts continued from his time at admiring artwork in his native temples.