Complex sentence: South Korea is one of the top-performing OECD countries in reading literacy, mathematics and sciences with the average student scoring 542 and has one of the worlds highest-educated labour forces among OECD countries.
Split into simpler sentences: South Korea is one of the top-performing OECD countries in reading literacy, mathematics and sciences with the average student scoring 542. The country has one of the worlds highest-educated labour forces among OECD countries.