Complex sentence: At Oxford he obtained a master's degree in Neurological Sciences, he moved on to complete his residency and fellowship training in the Department of Neurosurgery and the Brain Tumor Research Center at the University of California in San Francisco.
Split into simpler sentences: At Oxford he obtained a master's degree in Neurological Sciences. He moved on to complete his residency and fellowship training in the Department of Neurosurgery and the Brain Tumor Research Center at the University of California in San Francisco.