( ( ( The ( Earth 's ) ) seasons ) ( ( occur ( because ( ( ( the ( Earth 's ) ) ( rotation axis ) ) ( is tilted ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN Earth) (POS 's)) (NNS seasons)) (VP (VBP occur) (SBAR (IN because) (S (NP (NP (DT the) (NN Earth) (POS 's)) (NN rotation) (NNS axis)) (VP (VBZ is) (VP (VBN tilted)))))) (. .)))
The Earth's seasons occur because the Earth's rotation axis is tilted.
(ROOT (S (NP (NP (DT The) (NN tilt)) (PP (IN of) (NP (NP (NN earth)) (PP (IN on) (NP (PRP$ its) (NNS axis)))))) (VP (VBZ is) (NP (NP (CD one) (NN factor)) (SBAR (WHNP (WDT that)) (S (VP (VBZ contributes) (PP (TO to) (NP (NP (NNS seasons)) (VP (VBG occurring) (PP (IN in) (NP (JJ new) (NN york) (NN state))))))))))) (. .)))