Complex sentence: Paikidze announced that she expects to boycott the Women's World Chess Championship 2017 in Tehran, Iran due to its hijab dress code: I will not wear a hijab and support women's oppression.
Split into simpler sentences: Paikidze announced that she will boycott the Women's World Chess Championship 2017 in Tehran, Iran due to its hijab dress code. She has stated, I will not wear a hijab and support women's oppression.