Complex sentence: In Japan, the idea of a part time worker is someone who works for a set period, with no bonuses or fringe benefits, which many employers use, even today, to use women as supplementary labor with no chance of advancement and unstable job security.
Split into simpler sentences: In Japan, the idea of a part time worker is someone who works for a set period, with no bonuses or fringe benefits. Many employers used part time women workers as supplementary labor with no chance of advancement and unstable job security.