Complex sentence: He therefore recommended that von Braun work more closely with Kammler to solve the problems of the V-2, but von Braun claimed to have replied that the problems were merely technical and he was confident that they would be solved with Dornberger's assistance.
Split into simpler sentences: He therefore recommended that von Braun work more closely with Kammler to solve the problems of the V-2. Von Braun claimed to have replied that the problems were merely technical and he was confident that they would be solved with Dornberger's assistance.