( ( ( The ( seasonal ( ( -LRB- ( winter-to-summer -RRB- ) ) contrast ) ) ) ( in ( length ( of day ) ) ) ) ( ( increases ( with ( increasing latitude ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (ADJP (JJ seasonal)) (PRN (-LRB- -LRB-) (NP (NN winter-to-summer)) (-RRB- -RRB-)) (NN contrast)) (PP (IN in) (NP (NP (NN length)) (PP (IN of) (NP (NN day)))))) (VP (VBZ increases) (PP (IN with) (NP (VBG increasing) (NN latitude)))) (. .)))
The seasonal (winter-to-summer) contrast in length of day increases with increasing latitude.
(ROOT (S (NP (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN increase)) (PP (IN in) (NP (NN length)))) (VP (VBZ happens) (PP (TO to) (NP (NN metal) (NN railroad) (NNS tracks))) (PP (IN during) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (DT a) (NN summer) (NN day)))))) (. .)))