Complex sentence: Although Durand is perhaps best known for his allegorical portraits, he achieved international artistic acclaim for his official portraits of John Paul II (1983) and the Dalai Lama (1983,1989).
Split into simpler sentences: Although Durand is perhaps best known for his allegorical portraits. He achieved international artistic acclaim for his official portraits of John Paul II (1983) and the Dalai Lama (1983,1989).