Complex sentence: The facts of her life are difficult to verify, but this much is well established: she was born in Nghệ An Province near the end of the rule of the Trịnh Lords, and moved to Hanoi while still a child.
Split into simpler sentences: The facts of her life are difficult to verify but this much is well established. She was born in Nghệ An Province near the end of the rule of the Trịnh Lords, and she moved to Hanoi while still a child.