Complex sentence: The degrees awarded (and their letters) are dependant on which of the two ancient universities, Oxford or Cambridge, the Archbishop chooses as his model which is tied with the nature of the academic dress used as well.
Split into simpler sentences: The degrees awarded (and their letters) are dependant on which of the two ancient universities, Oxford or Cambridge, the archbishop chooses as his model. This is also tied with the nature of the academic dress used as well.