Complex sentence: His mother was a confident woman who shortly after the birth of her son's relationship with Karl Blind began a former student who had been expelled because of his radically democratic sentiments of the University of Heidelberg.
Split into simpler sentences: His mother was a confident woman, who shortly after her son's birth, began relationship with Karl Blind. Blind was a former student, who had been expelled because of his radically democratic sentiments by the University of Heidelberg.