Complex sentence: This language is considered to be part of the West Papuan language family, and so unlike most other languages spoken in Indonesia which belong to the Austronesian language family, it is rather related to languages spoken in Bird's Head peninsula in Papua.
Split into simpler sentences: This language is considered to be part of the West Papuan language family. Therefore his language is unlike most language spoken in Indonesia, which belong to Austronesian language family, but rather related to language spoken in Bird's Head peninsula in Papua.