Complex sentence: Kettlewell was born in Howden, Yorkshire, was educated at Charterhouse School, and from 1926 studied medicine with zoology at Gonville and Caius College, Cambridge.
Split into simpler sentences: Kettlewell was born in Howden, Yorkshire, was educated at Charterhouse School. In 1926 he studied medicine and zoology at Gonville and Caius College, Cambridge.