( ( The temperature ) ( ( ( remains constant ) ( until ( ( the ( phase change ) ) ( is complete ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN temperature)) (VP (VBZ remains) (ADJP (JJ constant)) (SBAR (IN until) (S (NP (DT the) (NN phase) (NN change)) (VP (VBZ is) (ADJP (JJ complete)))))) (. .)))
The temperature remains constant until the phase change is complete.
(ROOT (S (PP (IN During) (NP (NN phase) (NN change))) (, ,) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (DT a) (NN system)))) (VP (VBZ remains) (ADJP (JJ constant))) (. .)))