Complex sentence: This nickname was used even when she started as a novice geisha, and Masuda did not learn her own real name until she was hospitalized at the age of 12 and the doctors called her Ms. Masuda.
Split into simpler sentences: This nickname was used even when she started as a novice geisha. She did not learn her real name until she was hospitalized at the age of 12 and the doctors called her Ms. Masuda.