( ( Secondary meristems ) ( ( develop ( after ( primary meristems ) ) ) . ) )
(ROOT (S (NP (JJ Secondary) (NNS meristems)) (VP (VBP develop) (PP (IN after) (NP (JJ primary) (NNS meristems)))) (. .)))
Secondary meristems develop after primary meristems.
(ROOT (S (NP (NNS Roots)) (VP (VBP grow) (PP (IN in) (NP (NN length) (CC and) (NN width))) (PP (IN from) (NP (DT the) (JJ primary) (CC and) (JJ secondary) (NN meristem)))) (. .)))