Complex sentence: He studied biology at the Ruprecht Karl University of Heidelberg until 1984 and finished his Ph.D at the German Cancer Research Center and the Ruprecht Karl University of Heidelberg in 1987.
Split into simpler sentences: He studied biology at the Ruprecht Karl University of Heidelberg till 1984. And finished his Ph.D at the German Cancer Research Center and the Ruprecht Karl University of Heidelberg in 1987.