Complex sentence: Her role in this ministry was very polemic due specially to a speech in the Mad-cow disease crisis, however, during her period, the government delegated all the competences about public health systems to the Autonomous Communities.
Split into simpler sentences: Her role in this ministry was very controversial mainly due to a speech she gave during the concern over Mad-cow disease. However, during her period in office, the government delegated all public health responsibilities to the Autonomous Communities.