Complex sentence: Uppar River, Nallathankal River, Palar (of palani) all join river Amaravathi, temples and village on the banks of river Amaravathi shows the ancient history.
Split into simpler sentences: Uppar River, Nallathankal River, Palar (of palani) all join at the river Amaravathi. The temples and village on the banks of the river Amaravathi show the ancient history.