Complex sentence: Fictional story claimed that Kurosawa Gentatsu, a physician who lived in Nihonbashi, became her foster parent (the middle class family) and she changed her name to Hanayo and became a concubine (In fact she was a mistress).
Split into simpler sentences: Fictional story claimed that Kurosawa Gentatsu, a physician who lived in Nihonbashi, became her foster parent, the middle class family. She changed her name to Hanayo and became a concubine (In fact she was a mistress).