I don't think he understood every word of it, he just understood the general meaning of what they were saying. Since the language of the Orcs was a corrupted form of Westron, Frodo, Sam, Merry, and Pippin could understand what they were saying, since they themselves spoke Westron.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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