Complex sentence: She won her first gold in the 4 x 100 metres relay and a silver medal in the 200 metres at the 2015 World Championships and is the 5th fastest woman ever in this event and tied 4th ever in the 100 metres.
Split into simpler sentences: She won her first gold medal in the 4 x 100 metres relay and a silver medal in the 200 metres at the 2015 World Championships. Elaine is considered as the 5th fastest woman ever in the 200m event and tied for 4th ever in the 100 metres.