( ( ( ( ( The Martians ) , ) ( as ( ( the story ) went ) ) ) , ) ( ( constructed ( ( ( an ( elaborate system ) ) ( of canals ) ) ( to ( ( ( transport ( life-sustaining water ) ) ( from ( ( Mars ' ) ( polar ( ice caps ) ) ) ) ) ( to ( ( the ( planet 's ) ) ( arid ( equatorial regions ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNPS Martians)) (, ,) (SBAR (IN as) (S (NP (DT the) (NN story)) (VP (VBD went)))) (, ,)) (VP (VBN constructed) (S (NP (NP (DT an) (JJ elaborate) (NN system)) (PP (IN of) (NP (NNS canals)))) (VP (TO to) (VP (VB transport) (NP (JJ life-sustaining) (NN water)) (PP (IN from) (NP (NP (NNP Mars) (POS ')) (JJ polar) (NN ice) (NNS caps))) (PP (TO to) (NP (NP (DT the) (NN planet) (POS 's)) (JJ arid) (JJ equatorial) (NNS regions))))))) (. .)))
The Martians, as the story went, constructed an elaborate system of canals to transport life-sustaining water from Mars' polar ice caps to the planet's arid equatorial regions.
(ROOT (S (NP (NNP Water)) (VP (VBZ takes) (NP (NP (DT the) (NN form)) (PP (IN of) (NP (NN ice)))) (PP (IN on) (NP (NN planet) (NNS mars)))) (. .)))