Complex sentence: In May 2017, she announced her retirement from federal politics to take effect during the summer to join the Canada Institute at the Woodrow Wilson International Center for Scholars, as a visiting fellow.
Split into simpler sentences: In May 2017, she announced her retirement from federal politics to take effect during the summer. It was subsequently announced that she was joining the Canada Institute at the Woodrow Wilson International Center for Scholars, as a visiting fellow.