Complex sentence: Doctors told her family that Brown had "significantly diminished" brain function and that recovery would be miraculous; by Monday, February 2, Brown had shown significant improvement, but doctors warned of neurological damage due to the lack of oxygen.
Split into simpler sentences: Doctors told her family that Brown had "significantly diminished" brain function and that recovery would be miraculous. By February 2, Brown had shown significant improvement, but doctors warned of neurological damage due to the lack of oxygen.