( ( ( ( Elements , ) ( ( of which ) ( there ( are ( 109 ( in nature ) ) ) ) ) ) , ) ( ( are ( ( the ( basic ( building blocks ) ) ) ( of matter ) ) ) . ) )
(ROOT (S (NP (NP (NNS Elements)) (, ,) (SBAR (WHPP (IN of) (WHNP (WDT which))) (S (NP (EX there)) (VP (VBP are) (NP (NP (CD 109)) (PP (IN in) (NP (NN nature))))))) (, ,)) (VP (VBP are) (NP (NP (DT the) (JJ basic) (NN building) (NNS blocks)) (PP (IN of) (NP (NN matter))))) (. .)))
Elements, of which there are 109 in nature, are the basic building blocks of matter.
(ROOT (S (S (NP (NN Element)) (VP (VBZ is) (NP (NP (DT the) (JJ basic) (NN chemical) (NN building) (NN block)) (PP (IN of) (NP (NN matter)))))) (: ;) (S (NP (PRP it)) (VP (VBZ is) (NP (DT the) (JJS simplest) (NN chemical) (NN substance)))) (. .)))