Complex sentence: Adalbert of Prague (Czech:,, c.956--April 23,997), was a Czech Roman Catholic saint, a Bishop of Prague and a missionary who was martyred in his efforts to convert the Baltic Prussians.
Split into simpler sentences: Adalbert of Prague (Czech:,, circa 956--23 April 997), is a Czech Roman Catholic saint. He was the Bishop of Prague and a missionary who was martyred in his efforts to convert the Baltic Prussians.