Complex sentence: He was concerned about distress among farmers, who comprised over a fourth of the population, so in 1922 he took over the "American Agriculturalist" magazine, making it a voice for reclamation, conservation, and scientific farming.
Split into simpler sentences: He was concerned about distress among farmers, who comprised over a fourth of the population. In 1922 he took over the "American Agriculturalist" magazine, making it a voice for reclamation, conservation, and scientific farming.