Complex sentence: Queen Jadwiga (c.1374--1399) reigned from 1384 to 1399, venerated in the Roman Catholic Church as Saint Hedwig (Jadwiga) the Queen.
Split into simpler sentences: Queen Jadwiga (c.1374--1399) acquired the throne and reigned until 1399. She is venerated in the Roman Catholic Church as Saint Hedwig (Jadwiga) the Queen.