Complex sentence: On demobilization he was given a further education and training grant and studied at University College London, graduating with a first class honours degree in physics, and then at University of Oxford, obtaining a DPhil, in 1953, under Kurt Mendelssohn.
Split into simpler sentences: On demobilization he was given a further education, a training grant, and studied at University College London (UCL). He graduated with a first class honours degree in physics from UCL, and then at University of Oxford, he obtained a DPhil, in 1953, under Kurt Mendelssohn.