Complex sentence: Newton chaired the Hansard Society "Commission on Parliamentary Scrutiny" which ran from 1999 to 2001, which concluded that Parliament was being left behind by changes in the constitution, government and society and set out reforms for improving its function.
Split into simpler sentences: Newton chaired the Hansard Society "Commission on Parliamentary Scrutiny" which ran from 1999 to 2001. The Commission concluded that Parliament was being left behind by changes in the constitution, government and society and set out reforms for improving its function.