Complex sentence: In Tunisia he was wounded in an eye and, before returning to Corsica (where he supported pro-Italy secessionists), he met Benito Mussolini in Rome and actively collaborated with the Italian forces in Corsica during the first months of 1943.
Split into simpler sentences: In Tunisia he was wounded in an eye and, before returning to Corsica, he met Benito Mussolini in Rome. He actively collaborated with the Italian forces in Corsica during the first months of 1943.