Complex sentence: When her mother and Bea track her down, she is again humiliated to be identified as black and ultimately tells her mother that she is going away, never to return, so she can pass as a white woman without the fear that Delilah will show up.
Split into simpler sentences: When her mother and Bea track her down, she is humiliated to be identified as black. She finally tells her mother that she is going away, never to return, so she can pass as a white woman without the fear that Delilah will show up.