( ( Like ( their ( ancient relatives ) ) ) ( , ( ( all ( living mammals ) ) ( ( have ( three ( middle ( ear bones ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Like) (NP (PRP$ their) (JJ ancient) (NNS relatives))) (, ,) (NP (DT all) (VBG living) (NNS mammals)) (VP (VBP have) (NP (CD three) (JJ middle) (NN ear) (NNS bones))) (. .)))
Like their ancient relatives, all living mammals have three middle ear bones.
(ROOT (S (NP (DT The) (JJ mammalian) (JJ middle) (NN ear)) (VP (VBZ has) (NP (CD three) (NNS bones))) (. .)))