For example, if there exists in an ecosystem an animal that is slow (easy to catch), abundant, and yields high amounts of energy, humans will prey on that animal rather than on a fast, small, animal in the same ecosystem.
(an animal; is easy; slow) (humans; will prey; on that animal rather than on a fast, small, animal in the same ecosystem)
an animal humans
is easy will prey
slow
on that animal rather than on a fast, small, animal in the same ecosystem