Complex sentence: He graduated from Queens'College, Cambridge, with a starred first and then did postgraduate work at St John's and Merton at Oxford, and then taught at Durham from 1980 as a lecturer, then professor before moving to Exeter in 1996.
Split into simpler sentences: He graduated from Queens'College, Cambridge, with a starred first and then did postgraduate work at St John's and Merton at Oxford University. He then taught at Durham University from 1980 as a lecturer, then professor before moving to Exeter University in 1996.