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General Franks received the honorary title of Knight.
Literal
Franks army-general [subj-が] knight-title [gen-の] honorary-name [obj-を] was-bestowed [polite-ました].
授かる is the elevating/humble verb for 'to be granted / bestowed with (a title, gift, blessing),' used from the receiver's perspective when speaking of honors conferred from a higher authority. The active/giver counterpart is 授ける 'to bestow.' 陸軍大将 'army general' is a formal military rank compound. ナイト爵位 combines the English loan ナイト 'knight' with the sinitic 爵位 'rank / peerage,' a common way Japanese absorbs foreign titles into native noun compounds.