Simplify the following text for a Grade 8 native English-speaking person.
Original: On 6 October 2010 , the non-governmental organization Freedom Now , which serves as international counsel to Liu Xiaobo as retained by his family , publicly released a letter from 30 U.S. Members of Congress to President Barack Obama ( the 2009 Nobel Peace Prize laureate ) , urging him to directly raise both Liu Xiaobo 's case and that of fellow imprisoned dissident Gao Zhisheng to Chinese President Hu Jintao at the G-20 Summit in November 2010 .
Simplified: Freedom Now is a non-governmental organization and works as a lawyer for Liu Xiaobo outside China . On 6 October 2010 , they publicly released a letter from 30 U.S. Members of Congress to President Barack Obama ( the 2009 Nobel Peace Prize winner ) .