Complex sentence: On the death of Cardinal Giovanni Colonna on 26 September 1508, Pompeo was named bishop of Rieti by Pope Julius II on 6 October 1508; he ruled the diocese until he resigned in 1520 in favor of his nephew, Scipione Colonna.
Split into simpler sentences: On the death of Cardinal Giovanni Colonna on 26 September 1508, Pompeo was named bishop of Rieti by Pope Julius II on 6 October 1508. Pompeo ruled the diocese until he resigned in 1520 in favor of his nephew, Scipione Colonna.