by bad luck and their own immaturity 
(ROOT (PP (IN by) (NP (NP (JJ bad) (NN luck)) (CC and) (NP (PRP$ their) (JJ own) (NN immaturity)))))
(ROOT (PP (IN ) (NP (NP (JJ ) (NN )) (CC ) (NP (PRP$ ) (JJ ) (NN )))))