Complex sentence: In the 2012--2013 Junior Grand Prix season, Zenkova and Sinitsin won the silver medal in Courchevel, France, and then won their first JGP title in Zagreb, Croatia, which qualified them for their first JGP Final in Sochi, Russia and finished 5th.
Split into simpler sentences: In the 2012--2013 Junior Grand Prix season, Zenkova and Sinitsin won the silver medal in Courchevel, France, and then won their first JGP title in Zagreb, Croatia. They qualified for their first JGP Final in Sochi, Russia and finished 5th.