Complex sentence: The Pope needed new, more advantageous political alliances, so he may have covertly ordered the execution of Giovanni: the generally accepted version is that Lucrezia was informed of this by her brother Cesare, and she warned her husband, who fled Rome.
Split into simpler sentences: The Pope needed new, more advantageous political alliances, so he may have covertly ordered the execution of Giovanni. The generally accepted version is that Lucrezia was informed of this by her brother Cesare, and she warned her husband, who fled Rome.