verb agreement - Is this mixture of plural and singular legitimate?



But what is most important for our purposes is that these changes were the signal for the resumption of historical debate on a grand scale, of the kind that had been suspended or driven underground during the reign of Louis XIV. (The French Idea of Revolution ed. by Dale Van Kley: 203)



I am interested in the expression "these changes were the signal". Shouldn't every change be a signal, so that there are many signals? Why use the singular form? Because all these changes together form a signal, and one or two just cannot signify that there is a resumption of that debate?




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