Complex sentence: In 2012, KKU won the bid to host University and high school students from schools from across the country for the eighth year that the European Union sponsors a Thailand National Inter-varsity Debate Tournament (EUTH) modeled on the European Universities Debating Championship (EUDC).
Split into simpler sentences: In 2012, KKU won the bid to host University and high school students from schools from across the country for the eighth edition of the national debate tournament-the European Union-Thailand Intervarsity Debate Championship (also known as the 8th EU-TH). The tournament, sponsored by the European Union, was modeled on the European Universities Debating Championship (EUDC).