Complex sentence: A pioneering female American doctor, medical researcher and an outspoken voice in the pediatric community, the supercentenarian Leila Alice Denmark (1898--2012) is credited as co-developer of the pertussis (whooping cough) vaccine.
Split into simpler sentences: A pioneering female American doctor, medical researcher, and an outspoken voice in the pediatric community. She is credited as co-developer of the pertussis (whooping cough) vaccine.