Complex sentence: In 2013, fifty-eight percent (gross percent) of the Saudi population was enrolled in tertiary education; however, it is estimated that sixty-three percent of the degrees that students get are not "useful for private-sector jobs".
Split into simpler sentences: In 2013, fifty-eight percent (gross percent) of the Saudi population was enrolled in tertiary education. It is estimated that sixty-three percent of the degrees that students get are not "useful for private-sector jobs".