a satisfactory overview of the bizarre world of extreme athletes as several daredevils 
(ROOT (NP (NP (DT a) (JJ satisfactory) (NN overview)) (PP (IN of) (NP (NP (DT the) (JJ bizarre) (NN world)) (PP (IN of) (NP (JJ extreme) (NNS athletes))) (PP (IN as) (NP (JJ several) (NNS daredevils)))))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (JJ ) (NNS ))) (PP (IN ) (NP (JJ ) (NNS )))))))