Complex sentence: During the late 1920s and 1930s, the area became widely known for its production of lettuce, lima beans, sugar beets, and walnuts; in the late 1930s, Reseda was a foremost producer of lettuce in the United States.
Split into simpler sentences: During the late 20's and 30's the area became widely known for its production of sugar beets, lima beans, walnuts and lettuce. In the late 30's, Reseda was a foremost producer of lettuce in the United States.