Complex sentence: The inscription was written in prose, is the oldest document of the Cham language and any Austronesian language, and testifies the existence of indigenous beliefs among the ancient Cham people of Champa kingdom.
Split into simpler sentences: The inscription was written in prose, and is the oldest document of the Cham language and any Austronesian language. It testifies the existence of indigenous beliefs among the ancient Cham people of Champa kingdom.