( ( A supernova ) ( ( creates ( ( the elements ) ( that ( ( are ( heavier ( than iron ) ) ) ( -LRB- ( ( such ( as ( ( gold and ) ( most ( of ( the ( other metals ) ) ) ) ) ) ) -RRB- ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN supernova)) (VP (VBZ creates) (NP (NP (DT the) (NNS elements)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (ADJP (JJR heavier)) (PP (IN than) (NP (NN iron)))) (PRN (-LRB- -LRB-) (PP (JJ such) (IN as) (NP (NP (NN gold)) (CC and) (NP (NP (JJS most)) (PP (IN of) (NP (DT the) (JJ other) (NNS metals)))))) (-RRB- -RRB-))))))) (. .)))
A supernova creates the elements that are heavier than iron (such as gold and most of the other metals).
(ROOT (S (NP (NNS Supernovas)) (VP (VBP are) (ADJP (ADJP (NP (NP (DT the) (NN source)) (PP (IN of) (NP (NNS elements)))) (JJR heavier)) (PP (IN than) (NP (NN iron))))) (. .)))