Complex sentence: A 2009 poll revealed that 47% of South Korean children were uncertain or negative on the subject of whether they could make friends with a biracial child; such racist prejudice is widespread throughout the South Korean education system.
Split into simpler sentences: A 2009 poll revealed that 47% of South Korean children were uncertain or negative on the subject of whether they could make friends with a biracial child. Ethnic prejudice is widespread throughout the South Korean education system.