Complex sentence: A boatman named Sondol was killed under a false accusation, so to remember his unfair death and appease with the soul, boatmen and fishermen perform a ritual on this day.
Split into simpler sentences: A boatman named Sondol (Hangul: 손돌) was killed under a false accusation. So to remember his unfair death and appease with the soul, boatmen and fishermen perform a ritual on this day.