Complex sentence: Such is the plight of this species that Ol Pejeta is now planning to cross-breed the closely related southern white rhinos with the northern whites, to preserve northern white rhino genetics in hybrid offspring.
Split into simpler sentences: Such is the plight of this species that Ol Pejeta is now planning to cross-breed the closely related southern whites with the northern whites. The aim is to preserve northern white rhino genetics in hybrid offspring.