Complex sentence: In 2012, she was ranked as the 70th most powerful woman in the world by Forbes magazine, which noted that she "... led the full-day Wikipedia blackout in protest against SOPA".
Split into simpler sentences: In 2012, she was ranked as the 70th most powerful woman in the world by Forbes magazine. It was especially noted that she "... led the full-day Wikipedia blackout in protest against SOPA".