Complex sentence: After finding the "Rose Key" in a cave in Iran which she narrowly escapes as it collapses, she travels to Paris, where she then enlists the help of George, her former lover whom she abandoned in Turkey while in pursuit of the stone.
Split into simpler sentences: After finding the "Rose Key" in a cave in Iran, she travels to Paris. She then enlists the help of George, her former lover whom she abandoned in Turkey while in pursuit of the stone.