Complex sentence: Lak is in the Patpatar-Tolai Sub-Group, which falls under the New Ireland-Tolai Group in the Western Oceanic language, a sub-group within the Austronesian family.
Split into simpler sentences: Lak is in the Patpatar-Tolai Sub-Group, which falls under the New Ireland-Tolai Group in the Austronesian Language family. Siar-Lak is a part of the Western Oceanic language, a sub-group within the Austronesian family.