Tā xiǎng zhǎo yī fèn bànrì gōngzuò lái jiāngù xuéyè.
He wants to find a part-time job so he can balance his studies.
Tips
usage
半日工作 specifically means 'half-day per day' work (mornings or afternoons). For more general part-time work the modern term is 兼职 (jiānzhí) or 半职 (bànzhí); 半日工作 sounds slightly old-fashioned and is more common in Hong Kong / formal job ads.