Complex sentence: Oxford is one of the most prestigious and reputable universities in the world, and is recognised as one of the world's "six super brands" by the Times "World Reputation Rankings" since 2011 when the first time such a league table was released.
Split into simpler sentences: Oxford is one of the most prestigious and reputable universities in the world. Moreover, the University has been recognised as among the world's "six super brands" by the Times "World Reputation Rankings" since 2011 when the first time such a league table was released.