Complex sentence: From 1991 to 1997 she was director of CBOS, Poland's largest public opinion research centre, since 1997 she has been the director of the Institute of Public Affairs, Poland, an independent, non-partisan public policy think tank.
Split into simpler sentences: From 1991 to 1997 she was director of CBOS, Poland's largest public opinion research centre. Since 1997, she has been the director of the Institute of Public Affairs, Poland, an independent, non-partisan public policy think tank.