Complex sentence: Pervushkina started her season by finishing 4th at her JGP event in Linz, Austria before winning her first JGP medal, bronze, in Zagreb, Croatia.
Split into simpler sentences: Pervushkina started her season by finishing 4th at her JGP event in Linz, Austria. She then went on to win her first JGP medal by finishing 3rd at her JGP event in Zagreb, Croatia.