Complex sentence: Nguyễn Thị Loan was appointed Miss Universe Vietnam 2017 by Tony Nguyen Quoc Toan, the national director of Miss Universe Vietnam pageant after the 2017 edition of the national pageant conflicted with the date of the Miss Universe pageant.
Split into simpler sentences: Nguyễn Thị Loan was appointed as "Miss Universe Vietnam 2017" by Tony Nguyen Quoc Toan, the national director of Miss Universe in Vietnam. The national pageant conflicted with the date of the Miss Universe pageant.