Complex sentence: Ian Robertson Porteous (born October 9,1930 in Crossgates, Fife, died 30 January 2011) was a mathematician at the University of Liverpool and an educator on Merseyside.
Split into simpler sentences: Ian Robertson Porteous (9 October 1930-30 January 2011) was a Scottish mathematician. He was a lecturer at the University of Liverpool and an educator on Merseyside.