Complex sentence: It was founded in 2004 when Clemens N. Nathan (1933-2015, and the Centre's first chairman) was persuaded to start a research centre as an arm of the Consultative Council of Jewish Organisations.
Split into simpler sentences: It was founded by Clemens N. Nathan (1933-2015) in 2004 who was also its first chairman. It is the research arm of the Consultative Council of Jewish Organisations.