Complex sentence: During 1915, Lamar acted as an agent for Franz von Rintelen, an agent for the German Navy intelligence New York City, in promoting strikes and work slowdowns in munitions plants by means of the "Labor's National Peace Council".
Split into simpler sentences: During 1915, Lamar acted as an agent for Franz von Rintelen, an agent for the German Navy intelligence in New York City. He promoted strikes and work slowdowns in munitions plants by means of the "Labor's National Peace Council".