Complex sentence: Noto held the position until October 2010, but left just prior to the negotiations which led up to the 2011 lockout, returning to Goldman Sachs in October of 2010 as the co-head of Goldman's global media group.
Split into simpler sentences: Noto held the position until October 2010, but left just prior to the negotiations which led up to the 2011 lockout. He returned to Goldman Sachs in October of 2010 as the co-head of Goldman's global media group.