Complex sentence: Nils Bang's oceanographic research began in 1965 when he joined the Naval Oceanographic Research unit in Youngsfield, near Cape Town, then moved to the Oceanographic Institute at the University of Cape Town, where his key research work was accomplished.
Split into simpler sentences: Nils Bang's oceanographic research began in 1965 when he joined the Naval Oceanographic Research unit in Youngsfield, near Cape Town. He then moved to the Oceanographic Institute at the University of Cape Town, where his key research was accomplished.