At later lessons we would be given a printed slip of paper entitled “Search the Scriptures,“ which was sent to the school by whatever national authority supervised the teaching of religion. (source)
This sentence strikes me as ungrammatical and missing the relative pronoun "which/that" that should follow "national authority". Shouldn't it be like this?
At later lessons we would be given a printed slip of paper entitled “Search the Scriptures,“ which was sent to the school by whatever national authority that supervised the teaching of religion.