Complex sentence: However, by 2013 it was shown that as the water consumption efficiency of the center-pivot irrigator improved over the years, farmers planted more intensively, irrigated more land, and grew thirstier crops.
Split into simpler sentences: However, by 2013 it was shown that as the water consumption efficiency of the center-pivot irrigator improved over the years. Farmers planted more intensively, irrigated more land, and grew thirstier crops.