Complex sentence: She suffered from frail health most of her life, was not able to continue the excavation after 1897, and in 1907 she suffered a severe mental breakdown and died in 1916 (in the Priory, Roehampton) at the age of 51.
Split into simpler sentences: She suffered from frail health most of her life and was not able to continue the excavation after 1897. In 1907, she suffered a severe mental breakdown and died in 1916 (in the Priory, Roehampton) at the age of 51.