Complex sentence: The developer subsequently tried to counterfeit this electrolyte in Taiwan, then to sell it cheaper than the Japanese could, but the formula had apparently been copied incompletely, and it lacked important substances essential in securing the long-term stability of the capacitors.
Split into simpler sentences: The developer subsequently tried to counterfeit this electrolyte in Taiwan, then to sell it cheaper than the Japanese could. But apparently the formula had been copied incompletely, and it lacked important substances essential in securing the long-term stability of the capacitors.