Task: Text Simplification
Input (English): David Sive ( September 22 , 1922 – March 12 , 2014 ) was an attorney , environmentalist , and professor of environmental law , who has been recognized as a pioneer in the field of United States environmental law .
Output (English): David Sive ( September 22 , 1922 – March 12 , 2014 ) was an American lawyer , environmentalist , and professor of environmental law .