( ( The disease ) ( ( is ( caused ( by ( ( ( a ( microscopic organism ) ) , ) ( ( ( Giardia lamblia ) , ) ( ( the ( cystic form ) ) ( of ( which ( ( is often ) ( found ( in ( mountain ( ( streams and ) lakes ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN disease)) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (DT a) (JJ microscopic) (NN organism)) (, ,) (NP (NP (NNP Giardia) (NNP lamblia)) (, ,) (NP (NP (DT the) (JJ cystic) (NN form)) (PP (IN of) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB often)) (VP (VBN found) (PP (IN in) (NP (NN mountain) (NNS streams) (CC and) (NNS lakes)))))))))))))) (. .)))
The disease is caused by a microscopic organism, Giardia lamblia, the cystic form of which is often found in mountain streams and lakes.
(ROOT (S (NP (NNS Streams)) (ADVP (RB often)) (VP (VBP start) (PP (IN in) (NP (NNS mountains)))) (. .)))