Complex sentence: In May 2015, Google announced it has placed someone new in Cutts' position as the head of the web spam team, but this person would not be an official spokesperson for publisher and webmaster issues.
Split into simpler sentences: In May 2015, Google announced it has placed someone new in Matt's position as the head of the web spam team. But, unlike Matt, this person will not be an official spokesperson for publisher and webmaster issues.