Complex sentence: In social criticism and economic literature, robber baron became a derogatory term applied to wealthy and powerful 19th-century American businessmen that appeared in North American periodical literature as early as the August 1870 issue of "The Atlantic Monthly" magazine.
Split into simpler sentences: In social criticism and economic literature, robber baron became a derogatory term applied to some wealthy and powerful 19th-century American businessmen. The term appeared in North American periodical literature as early as the August 1870 issue of "The Atlantic Monthly" magazine.