Complex sentence: Peter John Wyllie (b.8 February 1930, London, England) is a British petrologist who was Professor of Geology at the California Institute of Technology from 1983 until his retirement in 1999.
Split into simpler sentences: Peter John Wyllie (b.8 February 1930, London, England) is a British petrologist and academic. He was Professor of Geology at the California Institute of Technology from 1983 until his retirement in 1999.