( ( ( The ( only ( easy way ) ) ) ( to ( monitor ( the temperature ) ) ) ) ( ( is ( by ( ( observing ( ( the color ) ( of ( the brass ) ) ) ) ( as ( it ( is heated ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (RB only) (JJ easy) (NN way)) (SBAR (S (VP (TO to) (VP (VB monitor) (NP (DT the) (NN temperature))))))) (VP (VBZ is) (PP (IN by) (S (VP (VBG observing) (NP (NP (DT the) (NN color)) (PP (IN of) (NP (DT the) (NN brass)))) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ is) (ADJP (JJ heated))))))))) (. .)))
The only easy way to monitor the temperature is by observing the color of the brass as it is heated.
(ROOT (S (SBAR (IN Although) (S (NP (PRP it)) (VP (VBZ is) (NP (DT the) (JJS easiest) (S (VP (TO to) (VP (VB observe)))))))) (, ,) (NP (NN color)) (VP (VBZ is) (RB not) (ADJP (JJ ideal) (PP (IN as) (NP (DT a) (JJ sole) (NN way)))) (S (VP (TO to) (VP (VB identify) (NP (NNS minerals)))))) (. .)))