Complex sentence: Their goal was to see the affect of Strontium-90 in the soils as well as to see how it transferred to the grass then to the grazing animals such as cows and sheep, the animals we get milk from and consume for food.
Split into simpler sentences: Their goal was to see the affect of Strontium-90 in the soils. Which are cows and sheep, the animals we get milk from and consume for food.