Complex sentence: After his death without male heirs, all the Greater Poland Duchy passed to his only nephew Przemysł II. Crowned King of Poland in 1295 but murdered the next year, with his death the Greater Poland branch of the Piast dynasty became extinct.
Split into simpler sentences: After his death without male heirs, all of the Greater Poland Duchy passed to his only nephew Przemysł II, who was crowned King of Poland in 1295 but murdered the following year. With his death the Greater Poland branch of the Piast dynasty became extinct.