Complex sentence: The Yaéré extends from the low hills at the base of the Mandara Mountains in the southwest to Lake Chad in the north; in the east it merges with the permanent wetlands bordering the Logone.
Split into simpler sentences: The Yaéré extends from the low hills at the base of the Mandara Mountains in the southwest to Lake Chad in the north. In the east it merges with the permanent wetlands bordering the Logone.