Complex sentence: Meanwhile, debris from the crater in the main spillway was carried downstream, and caused damage to a nearby fish hatchery due to high turbidity, state workers began evacuating fish and eggs from the hatchery in an attempt to lessen damage.
Split into simpler sentences: Meanwhile, debris from the crater in the main spillway was carried downstream, and caused damage to a nearby fish hatchery due to high turbidity. State workers began evacuating fish and eggs from the hatchery in an attempt to lessen damage.