Complex sentence: The many island cultures within this vast triangle speak Polynesian languages, which are classified by linguists as part of the Malayo-Polynesian subgroup and thus ultimately derive from the proto-Austronesian language spoken in Southeast Asia 5000 years ago.
Split into simpler sentences: The many island cultures within this vast triangle speak Polynesian languages, which are classified by linguists as part of the Malayo-Polynesian subgroup. They ultimately derive from the proto-Austronesian language spoken in Southeast Asia 5000 years ago.