( ( An example ) ( ( would ( be ( having ( ( kidney stones ) ( removed ( if ( ( ( other forms ) ( of ( ( medication and ) treatments ) ) ) ( ( are not ) working ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT An) (NN example)) (VP (MD would) (VP (VB be) (VP (VBG having) (NP (NP (NN kidney) (NNS stones)) (VP (VBN removed) (SBAR (IN if) (S (NP (NP (JJ other) (NNS forms)) (PP (IN of) (NP (NN medication) (CC and) (NNS treatments)))) (VP (VBP are) (RB not) (VP (VBG working)))))))))) (. .)))
An example would be having kidney stones removed if other forms of medication and treatments are not working.
(ROOT (S (NP (DT The) (NN option) (S (VP (TO to) (VP (VB remove) (S (NP (NN kidney) (NNS stones)) (ADJP (JJ other) (PP (IN than) (NP (NN surgery))))))))) (VP (VBZ is) (NP (NN ultrasound) (NNS treatments))) (. .)))