Complex sentence: Ida Bauer (1882--1945) was a hysterical patient of Sigmund Freud whom he wrote a famous case study about using the psuedonym'Dora'.
Split into simpler sentences: Ida Bauer (1882--1945) was a hysterical patient of Sigmund Freud. He wrote a famous case study about her using the psuedonym'Dora'.