Complex sentence: It is located on the island of Tahiti, where the river first becomes a river in the mountains of Tahiti east of the town cener of Papeete and ends on the coast of Tahiti near Papeeno.
Split into simpler sentences: It is located on the island of Tahiti, where the river first becomes a river in the mountains of Tahiti east of the town cener of Papeete. The river ends on the coast of Tahiti near Papeeno.