Complex sentence: At school he decided on a career in medicine, in which his previous biological studies later proved so valuable, in 1927 he was awarded a State Scholarship to Cambridge University and also a Major Scholarship to Pembroke College.
Split into simpler sentences: At school he decided on a career in medicine, in which his previous biological studies later proved so valuable. In 1927 he was awarded a State Scholarship to Cambridge University and also a Major Scholarship to Pembroke College.