( ( For example ) ( , ( ( ( ( ( ( ( ( ( trends ( in ( ( the lengths ) ( of ( frost-free periods ) ) ) ) ) , ) ( ( the intensities ) ( of ( precipitation events ) ) ) ) , ) ( ( the occurrence ) ( of ( runs ( of ( heat-stress days ) ) ) ) ) ) , ) and ) ( ( the warming ) ( of ( ( soil temperatures ) ( in spring ) ) ) ) ) ( ( will ( be tracked ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NP (NP (NNS trends)) (PP (IN in) (NP (NP (DT the) (NNS lengths)) (PP (IN of) (NP (JJ frost-free) (NNS periods)))))) (, ,) (NP (NP (DT the) (NNS intensities)) (PP (IN of) (NP (NN precipitation) (NNS events)))) (, ,) (NP (NP (DT the) (NN occurrence)) (PP (IN of) (NP (NP (NNS runs)) (PP (IN of) (NP (JJ heat-stress) (NNS days)))))) (, ,) (CC and) (NP (NP (DT the) (NN warming)) (PP (IN of) (NP (NP (NN soil) (NNS temperatures)) (PP (IN in) (NP (NN spring))))))) (VP (MD will) (VP (VB be) (VP (VBN tracked)))) (. .)))
For example, trends in the lengths of frost-free periods, the intensities of precipitation events, the occurrence of runs of heat-stress days, and the warming of soil temperatures in spring will be tracked.
(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)))))) (. .)))