Complex sentence: The Consulate in Taipei was upgraded to an embassy in 1953, and therefore the Ambassador to China maintained residence at Taipei, Taiwan, in the Republic of China until relations were severed in 1979.
Split into simpler sentences: The Consulate in Taipei was upgraded to an embassy in 1953. Therefore, the Ambassador to China maintained residence at Taipei, Taiwan in the Republic of China until relations were severed in 1979.