( ( ( ( Increase ( the temperature ) ) and ) ( ( either ( ( ( the volume ) or ) ( ( ( the pressure ) or ) both ) ) ) ( have ( to increase ) ) ) ) . )
(ROOT (S (S (VP (VB Increase) (NP (DT the) (NN temperature)))) (CC and) (S (NP (CC either) (NP (DT the) (NN volume)) (CC or) (NP (NP (DT the) (NN pressure)) (CC or) (NP (DT both)))) (VP (VBP have) (S (VP (TO to) (VP (VB increase)))))) (. .)))
Increase the temperature and either the volume or the pressure or both have to increase.
(ROOT (S (PP (IN As) (NP (NN temperature) (NNS increases))) (, ,) (NP (NN volume)) (VP (VBZ increases)) (. .)))