Complex sentence: Galbraith served as Minister for Children and Education in the Scottish Executive under Donald Dewar from 1999 to 2000 and then as Minister for Environment, Sport and Culture until his resignation on 20 March 2001 from ministerial office and his parliamentary seats for health reasons.
Split into simpler sentences: Galbraith served as Minister for Children and Education in the Scottish Executive under Donald Dewar from 1999 to 2000 and then as Minister for Environment, Sport and Culture. On 20 March 2001 he announced his resignation from ministerial office and his parliamentary seats for health reasons.