['he', 'need', 'sample', 'EmptyParameter', 'EmptyParameter']
['<PRP>', 'want-32.1', "Synset('arrangement.n.03')", 'EmptyParameter', 'EmptyParameter']
He would have needed such samples to conduct experiments on vaccine creation.
<PRP> would have needed such Synset('arrangement.n.03') to conduct Synset('undertaking.n.01') on Synset('antigen.n.01') Synset('whole.n.02').