Complex sentence: Hussitism began during the long reign of Wenceslas IV (1378--1419), a period of papal schism and concomitant anarchy in the Holy Roman Empire, and was precipitated by a controversy at Charles University in Prague.
Split into simpler sentences: Hussitism began during the long reign of Wenceslas IV (1378--1419), a period of papal schism and concomitant anarchy in the Holy Roman Empire. It was precipitated by a controversy at Charles University in Prague.