Complex sentence: Reporting on this topic is sporadic, almost non existent (Voisey and Church, 2000) and any progress made (since Rio and the Brudtland report) is done so on to a backdrop of the sustainable development rhetoric.
Split into simpler sentences: Reporting on this topic is sporadic, almost non existent Voisy, H., and Church, C., 2000. Earthscan Publications Ltd. and any progress made (since Rio and the Brudtland report) is done so on to a backdrop of the sustainable development rhetoric.