Complex sentence: Later on, however, she gave a full description of the dream she had had, and how she had escaped from her father's palace; which is a long story recorded in Donalson's book, along with further discussion on the authenticity of this story.
Split into simpler sentences: Later on, however, she gave a full description of the dream she had had, and how she had escaped from her father's palace. This lengthier story is recorded in Donaldson's book, along with further discussion on the authenticity of this story.