Complex sentence: The Swiss franc is often considered a reserve currency as well, due to the perceived stability of the currency and the Swiss banking system, although the share of all foreign exchange reserves held in Swiss francs has historically been well below 0.5%.
Split into simpler sentences: The Swiss franc is often considered a reserve currency, because of the perceived stability of the currency and the Swiss banking system. However, the share of all foreign exchange reserves held in Swiss francs has historically been well below 0.5%.