Complex sentence: Parisam vaippu is the most ancient Hindu devotional ritual in the world, observed by the Arayan (Arayar, Arya) community of parts of Kerala and Tamil Nadu in India.
Split into simpler sentences: Parisam vaippu is the most ancient Hindu devotional ritual. It is observed by the Arayan (Arayar, Arya) community of parts of Kerala and Tamil Nadu in India.