Complex sentence: In the middle of the reserve, the Ewaso Ng'iro flows through doum palm groves and thick riverine forests and provides water, without which the game in this arid region could not survive.
Split into simpler sentences: In the middle of the reserve, the Ewaso Ng'iro flows through doum palm groves and thick riverine forests. It provides water, without which the game in this arid region could not survive.