Complex sentence: On 20 July 2017 "Hypatia" announced that Sally Scholz, the editor-in-chief, and Shelley Wilcox, editor of Hypatia Reviews Online, had resigned, and that the directors had suspended the authority of the associate editors to choose the next editor.
Split into simpler sentences: On 20 July "Hypatia" announced that Sally Scholz, the editor-in-chief, and Shelley Wilcox, editor of Hypatia Reviews Online, had resigned. The directors added that they were suspending the authority of the associate editors to choose the next editor.