( ( ( ( The middle ) ( of ( a chain ) ) ) ( of ( ( three bones ) ( of ( the ( mammalian ( middle ear ) ) ) ) ) ) ) . )
(ROOT (NP (NP (DT The) (NN middle)) (PP (IN of) (NP (DT a) (NN chain))) (PP (IN of) (NP (NP (CD three) (NNS bones)) (PP (IN of) (NP (DT the) (JJ mammalian) (JJ middle) (NN ear))))) (. .)))
The middle of a chain of three bones of the mammalian middle ear.
(ROOT (S (NP (DT The) (JJ mammalian) (JJ middle) (NN ear)) (VP (VBZ has) (NP (CD three) (NNS bones))) (. .)))