Complex sentence: New Mexico State Parks operates a visitor center that contains information on the construction of the dam.mIt was the largest irrigation dam ever built at the time of it's construction, only being surpassed in 1970 by the Aswan Dam in Egypt.
Split into simpler sentences: New Mexico State Parks operates a visitor center that contains information on the construction of the dam. It stood as the largest irrigation dam ever built at the time of it's construction, only being surpassed in 1970 by the Aswan Dam in Egypt.