a former convent
... that Pope Pius IX ensured that the American College would get the property of a former convent where he used to serve Mass as a boy?
... that <a href="./Pope_Pius_IX" id="mwAc4" rel="mw:WikiLink" title="Pope Pius IX">Pope Pius IX</a> ensured that the <a href="./Pontifical_North_American_College" id="mwAc8" rel="mw:WikiLink" title="Pontifical North American College">American College</a> would get the property of <b id="mwAdA"><a href="./Casa_Santa_Maria" id="mwAdE" rel="mw:WikiLink" title="Casa Santa Maria">a former convent</a></b> where he used to serve <a href="./Mass_(liturgy)" id="mwAdI" rel="mw:WikiLink" title="Mass (liturgy)">Mass</a> as a boy?