Complex sentence: Dr. Webster realized that Goddard had accomplished a good deal of fine work and insisted that Goddard publish his progress so far or he would take care of it himself, so Goddard asked the Smithsonian Institution if it would publish the report he had submitted in late 1916.
Split into simpler sentences: Dr. Webster realized that Goddard had accomplished a good deal of fine work and insisted that Goddard publish his progress so far or he would take care of it himself. So Goddard asked the Smithsonian Institution if it would publish the report he had submitted in late 1916.