Complex sentence: The Kajakai Dam is one of the two major hydroelectric power dams of Helmand province in northern central Afghanistan along with Arghandab Dam which also serves to irrigate some 650,000 acres of formerly arid land.
Split into simpler sentences: The Kajakai Dam is one of the two major hydroelectric power dams of Helmand province in northern central Afghanistan. It has a dual function to provide electricity and serves to irrigate some 650,000 acres of formerly arid land.