Complex sentence: Upon completing his PhD at Magdalen, he accepted an offer to lecture on his research at the University of Manchester, where he met Alan Turing, a Bletchley Park veteran who became known as the father of computer science.
Split into simpler sentences: Upon completing his Doctor of Philosophy degree at Magdalen, he accepted an offer to lecture on his research at the University of Manchester. While there, he met Alan Turing, a Bletchley Park veteran who became known as the father of computer science.