Complex sentence: Olhovskiy reached his highest singles ATP-ranking on June 14,1993, when he became the number 49 of the world and his highest doubles ranking 6 (July 31,1995), played for the Russian Davis Cup team 1983--2001.
Split into simpler sentences: Olhovskiy reached his highest ATP singles ranking on June 14,1993, when he became World No.49, and his highest doubles ranking of No.6 (July 31,1995). He played for the Russian Davis Cup team 1983--2001.