( ( -LRB- ( A -RRB- ) ) ( ( recognize ( that ( seasons ( are ( caused ( by ( ( the tilt ) ( of ( ( Earth 's ) axis ) ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (-LRB- -LRB-) (NNP A) (-RRB- -RRB-)) (VP (VBP recognize) (SBAR (IN that) (S (NP (NNS seasons)) (VP (VBP are) (VP (VBN caused) (PP (IN by) (NP (NP (DT the) (NN tilt)) (PP (IN of) (NP (NP (NNP Earth) (POS 's)) (NNS axis)))))))))) (: ;)))
(A)  recognize that seasons are caused by the    tilt of Earth's axis;
(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))))))))))) (. .)))