Original sentence: In a review of Beckwith's book for Korean Studies, Thomas Pellard criticized Beckwith's work for serious methodological flaws, such as rejecting mainstream reconstruction of Chinese and Japanese and using his own instead, and his "too-easy and too-quick dismissal of the non-Japonic etymologies" in Koguryoic
Edited sentence: He suggests that the language of Goguryeo is most closely to Koreanic but both Koreanic and Japonic are both related and from one common proto-language.In a review of Beckwith's book for Korean Studies, Thomas Pellard criticized Beckwith's work for serious methodological flaws, such as rejecting mainstream reconstruction of Chinese and Japanese and using his own instead