Complex sentence: On November 2013, Gong Yoo was appointed as a special representative of the United Nations Children's Fund (UNICEF) in Korea, in conjunction with a celebration of the 24th year since the Convention on the Rights of the Child (CRC) was adopted.
Split into simpler sentences: On November 2013, Gong Yoo has been appointed as a special representative in the United Nations Children's Fund (UNICEF) in Korea. In Celebrating the 24th year since the Convention on the Rights of the Child (CRC) was adopted.