Complex sentence: He was a Rhodes Scholar at the University of Oxford, where he started a DPhil (but did not complete it), and he holds two engineering degrees, one from Darmstadt and one from Cornell.
Split into simpler sentences: He was a Rhodes Scholar at the University of Oxford, where he started a DPhil. Straub did not complete that course, but he gained two engineering degrees, one from Darmstadt and one from Cornell.