Complex sentence: Another explanation about the etymology of Seolleongtang says that "Seolleong" adopts the Mongols word "Sju-ru", which means broth.
Split into simpler sentences: Another explanation about the etymology of Seolleongtang is adoption the words of Mongols. It says that the Seolleongtang adopts the Mongols word "Sju-ru", which means broth.