( ( these three ) ( ( have ( ( many years ) ( of ( experience ( working ( with plants ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT these) (CD three)) (VP (VBP have) (NP (NP (JJ many) (NNS years)) (PP (IN of) (NP (NP (NN experience)) (VP (VBG working) (PP (IN with) (NP (NNS plants)))))))) (. .)))
these three have many years of experience working with plants.
(ROOT (S (NP (NNP Modern) (NNS plants)) (VP (VBP have) (NP (NP (CD three) (NNS types)) (PP (IN of) (NP (JJ major) (NNS tissues))))) (. .)))