Complex sentence: As Jadwiga's fiance, William, Duke of Austria, was also unpopular in Poland, the Lesser Poland faction succeeded in arranging for her to marry Władysław Jagiełło (Jogaila), Grand Duke of Lithuania, in 1386.
Split into simpler sentences: As Jadwiga's fiance, William, Duke of Austria, was also unpopular in Poland. Instead, the Lesser Poland faction succeeded in arranging for her to marry Władysław Jagiełło (Jogaila), Grand Duke of Lithuania, in 1386.