Complex sentence: John Barrett Hasted (February 17,1921--May 4,2002) was a British physicist, who from 1968 until his retirement was head of experimental physics at Birkbeck College, London.
Split into simpler sentences: John Barrett Hasted (February 17,1921--May 4,2002) was a British physicist. Barrett from 1968 until his retirement was head of experimental physics at Birkbeck College, London.