Complex sentence: In addition, Nestor has won 4 Grand Slam mixed doubles titles: 2007 Australian Open with Elena Likhovtseva, the 2011 Australian Open mixed doubles title with Katarina Srebotnik, and the 2013 Wimbledon and 2014 Australian Open mixed doubles titles with Kristina Mladenovic.
Split into simpler sentences: In addition, Nestor won the 2007 Australian Open mixed doubles title with Elena Likhovtseva and the 2011 Australian Open mixed doubles title with Katarina Srebotnik. Nestor also won the 2013 Wimbledon and 2014 Australian Open mixed doubles titles with Kristina Mladenovic.