Complex sentence: Robert Chambers (born 1932) is an academic and development practitioner who has, since the 1980s, been one of the leading advocates for putting the poor, destitute and marginalised at the centre of the processes of development policy.
Split into simpler sentences: Robert Chambers (born 1932) is an academic and development practitioner. Since the 1980s, he has been one of the leading advocates for putting the poor, destitute and marginalised at the centre of the processes of development policy.