Question: The 2009 African Junior Athletics Championships were held in Bambous, Mauritius, which multiple gold medallist, a South African middle-distance runner and 2016 Olympic gold medallist, broke championships records?
Sentence (from "Mack Horton"): At the 2016 Olympic Games in Rio de Janeiro, Brazil, he finished first in the 400m freestyle, winning his first gold medal and became the first male swimmer from the state of Victoria to do so in the Games' history.
Relevant evidence: No