turns into an ocean of trouble 
(ROOT (VP (VBZ turns) (PP (IN into) (NP (NP (DT an) (NN ocean)) (PP (IN of) (NP (NN trouble)))))))
(ROOT (VP (VBZ ) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN )))))))