Complex sentence: After teaching botany at Bryn Mawr College, she attended the University of Leipzig for two years, and then the University of Zurich, from which she received a PhD degree in 1890.
Split into simpler sentences: After teaching botany at Bryn Mawr College, she attended the University of Leipzig for two years. She did her doctoral work at the University of Zurich, from which she received a PhD degree in 1890.