['he', 'explain', 'problem', 'crew', 'to']
['<PRP>', 'transfer_mesg-37.1.1', "Synset('condition.n.01')", "Synset('unit.n.03')", 'to']
He is explaining the problem to the crew.
<PRP> is explaining the Synset('condition.n.01') to the Synset('unit.n.03').