Complex sentence: Marko Milošević was born in 1974 in downtown Belgrade while mother Mirjana Marković was teaching sociology at Belgrade University and father Slobodan Milošević was beginning to develop status in national politics.
Split into simpler sentences: Marko Milošević was born in 1974 in downtown Belgrade. At the time, his mother, Mirjana Marković, was a professor of sociology at the University of Belgrade and his father Slobodan Milošević was beginning to develop status in national politics.