( ( ( ( Phasmidia -RRB- ) ( ( ( , ( both ( of which ) ) ) contain ) ( important insect-parasitic ) ) ) nematodes ) . )
(ROOT (S (VP (VBD Phasmidia) (-RRB- -RRB-) (NP (NP (PRN (, ,) (ADVP (DT both)) (PP (IN of) (WHNP (WDT which)))) (NNS contain)) (ADJP (JJ important) (JJ insect-parasitic))) (NP (CD nematodes))) (. .)))
Phasmidia), both of which contain important insect-parasitic nematodes.
(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.