Complex sentence: In 1955 the second irrigation experimental farm in North Dakota was planned on the land of Bruce Larson, while a major concern of the late 1950's was the high nitrate condition in the wells of Sheyenne.
Split into simpler sentences: In 1955 the second irrigation experimental farm in North Dakota was planned on the land of Bruce Larson. A major concern of the late 1950s was the high nitrate condition in the wells of Sheyenne.