Complex sentence: The outing made her the center of the American political scandal known as the Plame affair, leading to her decision to resign from the CIA in December 2005, taking early retirement at the age of 42.
Split into simpler sentences: The outing made her the center of the American political scandal known as the Plame affair. Her public outing led her decision to resign from the CIA in December 2005, when she attempted to retire early at the age of 42.