Complex sentence: Mieszko Kazimierzowic ("Kazimierzowic " means"son of Kazimierz") (16 April 1045--28 January 1065) was a Polish prince member of the House of Piast and probably Duke of Kuyavia since 1058 until his death.
Split into simpler sentences: Mieszko Kazimierzowic ("Kazimierzowic " means"son of Kazimierz") (16 April 1045--28 January 1065) was a Polish prince member of the House of Piast. According to some scholars, he was probably Duke of Kuyavia since 1058 until his death.