Complex sentence: Grafton K. Mintz and Ha Tae-Hung's suggestion that the Korean reference was actually to the Thailand's Ayuhatta, has been refuted by George Cœdès because the Thai city was not founded until 1350 CE, much after the composition of "Samguk Yusa".
Split into simpler sentences: Grafton K. Mintz and Ha Tae-Hung implied that the Korean reference was actually to the Thailand's Ayuhatta. However, according to George Cœdès, the Thai city was not founded until 1350 CE, after the composition of "Samguk Yusa".