( ( During ( a supernova ) ) ( , ( ( all ( the elements ) ) ( ( heavier ( than IRON ) ) ( ( are made ) . ) ) ) ) )
(ROOT (S (PP (IN During) (NP (DT a) (NN supernova))) (, ,) (NP (PDT all) (DT the) (NNS elements)) (ADVP (ADVP (RBR heavier)) (PP (IN than) (NP (NNP IRON)))) (VP (VBP are) (VP (VBN made))) (. .)))
During a supernova, all the elements heavier than IRON are made.
(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))))) (. .)))