Complex sentence: As well as Hainan, the Li people are also found in some islands in the South China Sea area that are considered Filipino territory, and native islanders of the Luzon Sea are included under the "Li" ethnic group in China.
Split into simpler sentences: As well as Hainan, the Li people are also found in some islands in the South China Sea area that are considered Filipino territory. Native islanders of the Luzon Sea are included under the "Li" ethnic group in China.