Complex sentence: Although her health was good, Ci'an had been seriously ill twice according to Weng Tonghe, tutor of the Guangxu Emperor, once in March 1863 for 24 days, and another time in January 1870.
Split into simpler sentences: Although her health was good Ci'an had been seriously ill twice according to Weng Tonghe, who was tutor of the Guangxu Emperor. Once in march 1863 for 24 days and another time in January 1870.