Complex sentence: Additionally, when he opposed German bases in Africa, he did not intend to be neutral or to help the Allied camp, rather he only sought to prevent France from losing prestige with the natives and keep its colonial empire.
Split into simpler sentences: Additionally, when he opposed German bases in Africa, he did not intend to be neutral or to help the Allied camp. Rather, he only sought to prevent the French from losing prestige with the natives and keep their colonial empire.