( ( ( ( ( Many parasites ) , ) ( for ( ( example ( the protozoan ) ) ( that ( ( causes ` ) ( ( ( white ( spot ' ) ) disease ) ( in fish ) ) ) ) ) ) ) , ) ( ( ( are often ) ( clearly ( pathogenic ( to ( the host ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Many) (NNS parasites)) (, ,) (PP (IN for) (NP (NP (NN example) (DT the) (NN protozoan)) (SBAR (WHNP (WDT that)) (S (VP (VBZ causes) (`` `) (NP (NP (NP (JJ white) (NN spot) (POS ')) (NN disease)) (PP (IN in) (NP (NN fish))))))))) (, ,)) (VP (VBP are) (ADVP (RB often)) (ADJP (RB clearly) (JJ pathogenic) (PP (TO to) (NP (DT the) (NN host))))) (. .)))
Many parasites, for example the protozoan that causes 'white spot' disease in fish, are often clearly pathogenic to the host.
(ROOT (S (NP (NNS Trichomoniasis)) (VP (VBZ is) (VP (VB cause) (PP (IN by) (NP (DT a) (NN protozoa))))) (. .)))