Complex sentence: Sir Jon Shortridge KCB (born 1947) became Permanent Secretary of the Welsh Office in March 1999 and of the National Assembly for Wales on its creation in May 1999.
Split into simpler sentences: Sir Jon Shortridge KCB (born 1947) is a British Civil Servant. He served as the Permanent Secretary of the Welsh Office in March 1999 and of the National Assembly for Wales on its creation in May 1999.