( ( His research ) ( ( involves ( ( studying ( the ways ) ) ( ( ( ( a system ) ( responds ( to ( changes ( in ( ( temperature and ) pressure ) ) ) ) ) ) and ) ( ( ( why and ) how ) ( it ( changes ( from ( ( solid ( to liquid ) ) ( to gas ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ His) (NN research)) (VP (VBZ involves) (S (VP (VBG studying) (NP (DT the) (NNS ways)) (SBAR (SBAR (S (NP (DT a) (NN system)) (VP (VBZ responds) (PP (TO to) (NP (NP (NNS changes)) (PP (IN in) (NP (NN temperature) (CC and) (NN pressure)))))))) (CC and) (SBAR (WHADVP (WRB why) (CC and) (WRB how)) (S (NP (PRP it)) (VP (VBZ changes) (PP (IN from) (ADJP (ADJP (JJ solid) (TO to) (JJ liquid)) (PP (TO to) (NP (NN gas)))))))))))) (. .)))
His research involves studying the ways a system responds to changes in temperature and pressure and why and how it changes from solid to liquid to gas.
(ROOT (S (NP (NP (CD One) (NN way)) (SBAR (S (VP (TO to) (VP (VB change) (NP (NN water)) (PP (IN from) (NP (NP (DT a) (NN liquid)) (PP (TO to) (NP (DT a) (JJ solid)))))))))) (VP (VBZ is) (S (VP (TO to) (VP (VB decrease) (NP (DT the) (NN temperature)))))) (. .)))