Complex sentence: The epitaph recorded the year of death as AD 792 help corrected previous works such as Kim's (金毓黻) Balhae Kindgdom 《 渤海國志長編 》, which recorded AD 793 instead.
Split into simpler sentences: The epitaph recorded the year of death as AD 792. This corrected previous works such as Kim's (金毓黻) Balhae Kindgdom 《 渤海國志長編 》, which recorded AD 793 instead.