Complex sentence: The Tripuri people have a rich historical, social and cultural heritage which is totally distinct from that of the mainland Indians, their distinctive culture as reflected in their dance, music, festivals, management of community affairs, dress and food habit has a strong base.
Split into simpler sentences: The Tripuri people have a rich historical, social and cultural heritage which is totally distinct from that of the mainland Indians. Their distinctive culture--as reflected in their dance, music, festivals, management of community affairs, dress and food habits--has a strong base.