Complex sentence: A local mask maker is being tortured and Dee stops this, declaring that the masks were not made with local materials; also, the thugs spoke the Dondo language, a people who live between the Fuyu Kingdom and the Tang Dynasty.
Split into simpler sentences: A local mask maker is being tortured and Dee stops them from continuing, declaring that the masks were not made with local materials. Also that the thugs spoke the Dondo language, people who live between the Fuyu Kingdom and Tang Dynasty.