Complex sentence: She was the big figure at the 1984 Olympics in Sarajevo, winning all three individual Cross-country skiing events (5,10 and 20 km), and a bronze medal for Finland in the relay.
Split into simpler sentences: She was the big figure at the 1984 Olympics in Sarajevo. She won all the three individual Cross-country skiing (5,10 and 20 km), in addition she won a bronze medal for Finland on the relay.