Divide is related to Separate. Rail is a type of Separate. Rail is related to Pole. Pole is related to Staff. 
Observer is part of Experiment. Observer is a type of Expert. Talent is a type of Expert. 
Divide <--RelatedTo--> Separate <--IsA-- Rail <--RelatedTo--> Pole <--RelatedTo--> Staff 
Experiment <--PartOf-- Observer --IsA--> Expert <--IsA-- Talent 