( ( ( ( ( ( Our kidneys ) ( ( eliminate ( waste products ) ) ( through urine ) ) ) , ) and ) ( ( ( ( when ( there ( is ( excessive ( ( ( waste or ) ( not ( enough fluid ) ) ) volume ) ) ) ) ) ( , ( urine ( becomes supersaturated ) ) ) ) and ) ( ( a stone ) ( can form ) ) ) ) . )
(ROOT (S (S (NP (PRP$ Our) (NNS kidneys)) (VP (VBP eliminate) (NP (NN waste) (NNS products)) (PP (IN through) (NP (NN urine))))) (, ,) (CC and) (S (S (SBAR (WHADVP (WRB when)) (S (NP (EX there)) (VP (VBZ is) (NP (JJ excessive) (UCP (NP (NN waste)) (CC or) (ADJP (RB not) (RB enough) (JJ fluid))) (NN volume))))) (, ,) (NP (NN urine)) (VP (VBZ becomes) (ADJP (JJ supersaturated)))) (CC and) (S (NP (DT a) (NN stone)) (VP (MD can) (VP (VB form))))) (. .)))
Our kidneys eliminate waste products through urine, and when there is excessive waste or not enough fluid volume, urine becomes supersaturated and a stone can form.
(ROOT (S (NP (NNP Urine)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (JJ liquid) (NN waste)) (VP (VBN formed) (PP (IN by) (NP (NNS kidneys)))))))) (. .)))