Complex sentence: Agnar Sandmo (1938 -) is a Norwegian economist and Professor at NHH with a series of important research contributions tied to disparities, redistribution, insurance arrangements and tax systems.
Split into simpler sentences: Agnar Sandmo (1938 -) is a Norwegian economist and Professor at NHH. He has made a series of important research contributions tied to disparities, redistribution, insurance arrangements and tax systems.