( ( For example ) ( , ( ( ( the length ) ( of ( the day ) ) ) ( ( is increasing ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NP (DT the) (NN length)) (PP (IN of) (NP (DT the) (NN day)))) (VP (VBZ is) (VP (VBG increasing))) (. .)))
For example, the length of the day is increasing.
(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)))))) (. .)))