Complex sentence: Izzy was born on October 12,1979 (the same day that the first issue of "Doctor Who Weekly" was published), but she did not know where, nor did she know who her biological parents were.
Split into simpler sentences: Izzy was born on October 12,1979 (the same day that the first issue of "Doctor Who Weekly" was published). However she did not know where she had been born, nor did she know who her biological parents were.