Complex sentence: The music is now highly specialized, and uses just two different surviving melodies, and is played only at certain very rare concerts, such as the "Munmyo jeryeak" (Sacrifice to Confucius) held each spring and autumn at the Munmyo shrine in Seoul.
Split into simpler sentences: The music is now highly specialized, and uses just two different surviving melodies. It is played only at certain very rare concerts, such as the "Munmyo jeryeak" (Sacrifice to Confucius) held each spring and autumn at the Munmyo shrine in Seoul.