Complex sentence: After the retreat of the Kuomintang to Taiwan, the silver yuan remained the de jure legal currency of account of the Republic of China, although only Taiwan dollars issued by the Bank of Taiwan were circulating in areas controlled by the ROC.
Split into simpler sentences: After the retreat of the Kuomintang to Taiwan, the silver yuan remained the de jure legal currency of account of the Republic of China. This was despite the fact that only Taiwan dollars issued by the Bank of Taiwan were circulating in areas controlled by the ROC.