Complex sentence: On 3 February 2013, Thiam broke the junior indoor world record in the pentathlon at a meeting in Ghent with a total of 4558 points, breaking her personal best on 4 of the 5 events.
Split into simpler sentences: On 3 February 2013, Thiam broke the junior indoor world record on the pentathlon at a meeting in Ghent. Thiam totalled 4558 points, breaking her personal best on 4 of the 5 events.