Complex sentence: After 1570, when the pope declared her illegitimate and released her subjects from obedience to her, several conspiracies threatened her life, all of which were defeated with the help of her ministers' secret service.
Split into simpler sentences: After 1570, when the pope declared her illegitimate and released her subjects from obedience to her, several conspiracies threatened her life. All plots were defeated, however, with the help of her ministers' secret service.