Complex sentence: In the twentieth century there were also many major women writers, including Katherine Mansfield, Dorothy Richardson, Virginia Woolf, Eudora Welty, and Marianne Moore, and in France Colette and Simone de Beauvoir and in Russia Anna Akhmatova.
Split into simpler sentences: In the twentieth century there were also many major women writers, including Katherine Mansfield, Dorothy Richardson, Virginia Woolf, Eudora Welty, and Marianne Moore. And in France Colette and Simone de Beauvoir; and in Russia Anna Akhmatova.