Complex sentence: The main advisors in Terra were Knut Anders Opstad and Harald Norberg, of which the latter has been formerly fined by the Norwegian National Authority for the Investigation and Prosecution of Economic and Environmental Crime in the early 1990s for illegal sale of bonds to private individuals.
Split into simpler sentences: The main advisors in Terra were Knut Anders Opstad and Harald Norberg,. The latter has been previously fined by the Norwegian National Authority for the Investigation and Prosecution of Economic and Environmental Crime in the early 1990s for the illegal sale of bonds to private individuals.