Complex sentence: The pregnant Benita returned to Warsaw, where she was sent to the Pawiak Prison and in which she gave birth to a son, Tadeusz Michał, born on 8 April 1944.
Split into simpler sentences: The pregnant Benita returned to Warsaw and was sent to the Pawiak Prison. There she gave birth to a son, Tadeusz Michał, on 8 April 1944.