a prior doping offence
... that athletes from more than 50 countries who had a prior doping offence were allowed to compete at the 2016 Summer Olympics?
... that athletes from more than 50 countries who had <b id="mwA8o"><a href="./List_of_athletes_at_the_2016_Summer_Olympics_with_a_prior_doping_offence" id="mwA8s" rel="mw:WikiLink" title="List of athletes at the 2016 Summer Olympics with a prior doping offence">a prior doping offence</a></b> were allowed to compete at the <a href="./2016_Summer_Olympics" id="mwA8w" rel="mw:WikiLink" title="2016 Summer Olympics">2016 Summer Olympics</a>?