Complex sentence: Petexbatún is a small lake that is formed by the river with the same name, that splits from "La Pasion" river in Sayaxché, located in the southern area of the Guatemalan department of Petén.
Split into simpler sentences: Petexbatún is a small lake formed by a river of the same name, which is a tributary of the "La Pasion" river. It is near Sayaxché, located in the southern area of the Guatemalan department of Petén.