וַיְהִ֞י כִּשְׁמֹ֨עַ יָרָבְעָ֤ם בֶּן־נְבָט֙ וְה֣וּא בְמִצְרַ֔יִם אֲשֶׁ֣ר בָּרַ֔ח מִפְּנֵ֖י שְׁלֹמֹ֣ה הַמֶּ֑לֶךְ וַיָּ֥שָׁב יָרָבְעָ֖ם מִמִּצְרָֽיִם׃
E Jeroboão, filho de Nebate, que estava então no Egito para onde fugira da presença do rei Salomão, ouvindo isto, voltou do Egito.
Rashi
And it was when... heard The meaning is: And it was when he heard - prior to this, when they came to make him [Rehoboam] king in Shechem, when he [Jeroboam] was still in Egypt.