Complex sentence: Bristol is a member of the Russell Group of research-intensive British universities, the European-wide Coimbra Group and the Worldwide Universities Network, of which the University's Vice-Chancellor Prof. Eric Thomas was Chairman from 2005 to 2007.
Split into simpler sentences: Bristol is a member of the Russell Group of research-intensive British universities. It is also a member of the European-wide Coimbra Group and the Worldwide Universities Network, of which the University's Vice-Chancellor Prof. Eric Thomas was Chairman from 2005 to 2007.