( ( ( ( ( The work ) ( is hard ) ) and ) ( ( the ( summer heat ) ) ( increases ( the exhaustion ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN work)) (VP (VBZ is) (ADJP (JJ hard)))) (CC and) (S (NP (DT the) (NN summer) (NN heat)) (VP (VBZ increases) (NP (DT the) (NN exhaustion)))) (. .)))
The work is hard and the summer heat increases the exhaustion.
(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)))))) (. .)))