( ( ( Many types ) ( of pathogens ) ) ( ( cause ( disease ( in humans ) ) ) . ) )
(ROOT (S (NP (NP (JJ Many) (NNS types)) (PP (IN of) (NP (NNS pathogens)))) (VP (VBP cause) (NP (NP (NN disease)) (PP (IN in) (NP (NNS humans))))) (. .)))
Many types of pathogens cause disease in humans.
(ROOT (S (NP (NP (JJ Protist) (NNS diseases)) (PP (IN in) (NP (NNS humans)))) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NN protozoa))))) (. .)))