Complex sentence: Giustino has a career high ATP singles ranking of 213 achieved on 5 May 2014 and a career high ATP doubles ranking of 633 achieved on 8 July 2013.
Split into simpler sentences: Giustino has a career high ATP singles ranking of 213 achieved on 5 May 2014. He also has a career high ATP doubles ranking of 633 achieved on 8 July 2013.