Complex sentence: However, Meinhard died less than two years later without heirs and just under a month away from the age of twenty-one, precipitating an invasion by his Wittelsbach uncle Duke Stephen II of Bavaria-Landshut.
Split into simpler sentences: However, Meinhard died less than two years later without heirs and just under a month away from the age of twenty-one. His death precipitated an invasion by his Wittelsbach uncle Duke Stephen II of Bavaria-Landshut.