Complex sentence: Their appeal in the Eight Circuit Court of Appeals was opposed by Attorney General Herbert Brownell and the U.S. Department of Justice, the first intervention by the attorney general in support of any school district attempting to comply with the "Brown v. Board of Education" decision.
Split into simpler sentences: Their appeal in the Eight Circuit Court of Appeals was opposed by United States Attorney General Herbert Brownell and the U.S. Department of Justice. This marked the first intervention by the attorney general in support of any school district attempting to comply with the "Brown v. Board of Education" decision.