the men and machines behind the curtains of our planet 
(ROOT (NP (NP (DT the) (NNS men) (CC and) (NNS machines)) (PP (IN behind) (NP (NP (DT the) (NNS curtains)) (PP (IN of) (NP (PRP$ our) (NN planet)))))))
(ROOT (NP (NP (DT ) (NNS ) (CC ) (NNS )) (PP (IN ) (NP (NP (DT ) (NNS )) (PP (IN ) (NP (PRP$ ) (NN )))))))