won its first Pan American medals
... that Barbados won its first Pan American medals during the 1963 Pan American Games, held in São Paulo, Brazil?
... that <a href="./Barbados" id="mwAtM" rel="mw:WikiLink" title="Barbados">Barbados</a> <b id="mwAtQ"><a href="./1963_Pan_American_Games_medal_table" id="mwAtU" rel="mw:WikiLink" title="1963 Pan American Games medal table">won its first Pan American medals</a></b> during the <a href="./1963_Pan_American_Games" id="mwAtY" rel="mw:WikiLink" title="1963 Pan American Games">1963 Pan American Games</a>, held in <a href="./São_Paulo" id="mwAtc" rel="mw:WikiLink" title="São Paulo">São Paulo</a>, Brazil?