Complex sentence: Donkin had a seat on the general board of the National Physical Laboratory from 1922 to 1927, leaving to become chairman of the Association of Consulting Engineers until 1943 when he acted as an advisor to the government on a proposed Severn barrage scheme.
Split into simpler sentences: Donkin had a seat on the general board of the National Physical Laboratory from 1922 to 1927. He acted as an advisor to the government on a proposed Severn barrage scheme.