Complex sentence: Some of the Hyantes emigrated to isolated and pastoral Phocis, where they founded Hyampolis, or at least that gave a good explanation for its name, and some, it was said, fled to Aetolia, another region that retained a primitive character into Classical times.
Split into simpler sentences: Some of the Hyantes are said to have emigrated to isolated and pastoral Phocis, where they founded Hyampolis, or at least that gave a good explanation for its name. Others supposedly fled to Aetolia, another region that retained a primitive character into Classical times.