Complex sentence: Francis continued to work at the University of Wales as a Professor in Continuing Education from 1972 to 1999, when he became a Special Advisor to the Paul Murphy, the Secretary of State for Wales.
Split into simpler sentences: Francis continued to work at the University of Wales as a Professor in Continuing Education from 1972 to 1999. In 1999, Francis became a Special Advisor to Paul Murphy, the Secretary of State for Wales.