Complex sentence: Tuktamysheva began the 2015--16 season by placing 3rd in the individual competition of Japan Open before winning the gold medal at the 2015 International Cup of Nice.
Split into simpler sentences: Tuktamysheva began the 2015-16 season by placing 3rd in the individual competition of Japan Open. She then went on to win the gold medal at 2015 International Cup of Nice.