( Trichomoniasis ( ( is ( caused ( by ( ( ( Trichomonas foetus ) , ) ( ( a ( protozoan organism ) ) ( that ( lives ( on ( ( the ( ( penis and ) prepuce ) ) ( of ( the bull ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Trichomoniasis)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (NNP Trichomonas) (NNS foetus)) (, ,) (NP (NP (DT a) (NN protozoan) (NN organism)) (SBAR (WHNP (WDT that)) (S (VP (VBZ lives) (PP (IN on) (NP (NP (DT the) (NN penis) (CC and) (NN prepuce)) (PP (IN of) (NP (DT the) (NN bull))))))))))))) (. .)))
Trichomoniasis is caused by Trichomonas foetus , a protozoan organism that lives on the penis and prepuce of the bull.
(ROOT (S (NP (NNS Trichomoniasis)) (VP (VBZ is) (VP (VB cause) (PP (IN by) (NP (DT a) (NN protozoa))))) (. .)))