Complex sentence: There, she tells him that she is a spy, being chased by assassins, and that she has uncovered a plot to steal vital British military secrets, masterminded by a man with the top joint missing from one of his fingers.
Split into simpler sentences: There, she tells him that she is a spy, being chased by assassins. She claims to have uncovered a plot to steal vital British military secrets, masterminded by a man with the top joint missing from one of his fingers.