For the following sentence s expression result should be as following:
sentence:
Medical advice ranges from the confusing to the disapproving, while a financial disincentive could even transpire in the form of a long-mooted tax on soft drinks.
result:

(ROOT
(S
(NP (NNP Medical) (NN advice))
(VP (VBZ ranges)
(PP (IN from)
(NP (DT the)
(ADJP (JJ confusing)
(PP (TO to)
(NP (DT the) (NN disapproving))))))
(, ,)
(SBAR (IN while)
(S
(NP (DT a) (JJ financial) (NN disincentive))
(VP (MD could)
(ADVP (RB even))
(VP (VB transpire)
(PP (IN in)
(NP
(NP (DT the) (NN form))
(PP (IN of)
(NP
(NP (DT a) (JJ long-mooted) (NN tax))
(PP (IN on)
(NP (JJ soft) (NNS drinks))))))))))))

Your api response as there is only one node:

{
“text”: “(S\n (GPE Medical/JJ)\n advice/NN\n ranges/NNS\n from/IN\n the/DT\n confusing/NN\n to/TO\n the/DT\n disapproving/NN\n ,/,\n while/IN\n a/DT\n financial/JJ\n disincentive/JJ\n could/MD\n even/RB\n transpire/VB\n in/IN\n the/DT\n form/NN\n of/IN\n a/DT\n long/JJ\n -/:\n mooted/VBN\n tax/NN\n on/IN\n soft/JJ\n drinks/NNS\n ./.)”
}