Complex sentence: Prosecution of labor under antitrust laws would continue until the enactment of the Norris-La Guardia Act in 1932, which included express exemptions of organized labor from antitrust injunctions.
Split into simpler sentences: Prosecution of labor under the antitrust laws would continue until the enactment of the Norris-La Guardia Act in 1932. This New Deal legislation included express exemptions of organized labor from antitrust injunctions.