Complex sentence: Despite making a life's work of harassing poachers and monitoring bears, Nikolayenko was a polarising figure within the naturalist community, which had an institutionally unfavourable view of his pro-active approach to monitoring bears.
Split into simpler sentences: Despite making a life's work of harassing poachers and monitoring bears, Nikolayenko was a polarising figure within the naturalist community. Which had an institutionally unfavourable view of his pro-active approach to monitoring bears.