Complex sentence: In March 1486, Ascanio had a dispute with Cardinal Jean Balue, ambassador of France to Rome, because the latter suggested that the Pope should summon Rene d'Anjou to retrieve his rights over the Neapolitan throne.
Split into simpler sentences: In March 1486, Ascanio had a dispute with Cardinal Jean Balue, the French ambassador to Rome. The ambassador had suggested that the Pope should summon Rene d'Anjou to retrieve his rights over the Neapolitan throne.