Complex sentence: Several of the Guo claimed descent from Han chinese General Guo Ziyi, and then were distressed and disturbed at the fact that their claim of descent from Gui Ziyi contradicted their being Hui, which required foreign ancestors.
Split into simpler sentences: Several of the Guo claimed descent from Han chinese General Guo Ziyi. They were then were distressed and disturbed at the fact that their claim of descent from Gui Ziyi contradicted their being Hui, which required foreign ancestors.