( ( Strongylida This ) ( ( is ( ( a ( large order ) ) ( of ( nematodes ( which ( ( are ( of ( great ( economic importance ) ) ) ) ( both ( as ( ( human ( ( pathogens and ) parasites ) ) ( of ( veterinary animals ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Strongylida) (NNP This)) (VP (VBZ is) (NP (NP (DT a) (JJ large) (NN order)) (PP (IN of) (NP (NP (NNS nematodes)) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (PP (IN of) (NP (JJ great) (JJ economic) (NN importance))) (PP (DT both) (IN as) (NP (NP (JJ human) (NNS pathogens) (CC and) (NNS parasites)) (PP (IN of) (NP (JJ veterinary) (NNS animals)))))))))))) (. .)))
Strongylida This is a large order of nematodes which are of great economic importance both as human pathogens and parasites of veterinary animals.
(ROOT (S (NP (NNS Nematodes)) (VP (MD can) (VP (VB be) (NP (NP (DT a) (NN parasite)) (PP (IN of) (NP (DT both)))))) (. .)))
Nematodes can be a parasite of both.