Complex sentence: With the failure of Capri, Rommel decided that the only way to save the Axis armies would be to abandon the campaign and on 9 March travelled to Italy for discussions with "Comando Supremo" in Rome.
Split into simpler sentences: With the failure of "Capri", Rommel decided that the only way to save his armies would be to evacuate them. He therefore left Tunisia on 9 March for discussions with the "Comando Supremo" in Rome.