Original: Its poor conditions, Charlotte maintained, permanently affected her health and physical development and hastened the deaths of her two elder sisters, Maria (born 1814) and Elizabeth (born 1815), who died of tuberculosis in June 1825.
Simplified: The poor conditions of the school permanently affected Charlotte's health according to her. She thought it led to the early deaths of her two elder sisters, Maria (born 1814) and Elizabeth (born 1815).