Complex sentence: Some agricultural officials in Utah are worried that even crops could become contaminated from using toxic water, although they admit that they can't measure contamination accurately because of so many variables in farming, and state that the warnings were issued out of caution.
Split into simpler sentences: Some agricultural officials in Utah are worried that crops could become contaminated from toxic water. However officials can't know the degree of contamination because of so many variables in farming, admitting that the warnings were issued out of caution.