Complex sentence: The dam is one of three possible dams in the Stung Battambang basin; the other two would block two of the Battambang River's tributaries: the Mongkol Borey River and the Sangker River.
Split into simpler sentences: The dam is one of three possible dams in the Stung Battambang basin. The other two would block two of the Battambang River's tributaries, the Mongkol Borey River and the Sangker River.