Complex sentence: However, the historical validity of existing copy of "Hwarang Segi" is a subject of great controversy by the Japanese and majority of the Korean scholar; most scholars think of this as a forgery while some argue for its authenticity.
Split into simpler sentences: However, the historical validity of this copy of "Hwarang Segi" is a subject of great controversy among scholars of Korean studies. Most scholars think of this as a forgery while some argue for its authenticity.