Complex sentence: The remains of the missionary were held for ransom by the Prussians and Bohemian Přemyslid rulers refused to pay for Adalbert's (Vojtech) body, consequently it was purchased by Duke Bolesław for its weight in gold, and buried in Gniezno.
Split into simpler sentences: The remains of the missionary were held for ransom by the Prussians and Bohemian Přemyslid rulers refused to pay for Adalbert's body. Consequently it was purchased by Duke Bolesław in exchange for its weight in gold, and buried in Gniezno.