Complex sentence: One of the key subsidiaries of the centre is a privately held financial exchange that opened in September 2005 as Dubai International Financial Exchange (DIFX) but was rebranded as NASDAQ Dubai in the year 2008.
Split into simpler sentences: One of the key subsidiaries of the centre is NASDAQ Dubai (Formerly Dubai International Financial Exchange (DIFX)). It is a privately held financial exchange that opened in September 2005 as Dubai International Financial Exchange (DIFX) but it was rebranded as NASDAQ Dubai in the year 2008.