Complex sentence: She also trained neuropathologist Louise Eisenhardt, who became a renowned expert in diagnosing brain tumors and in 1959 was credited with training 70% of the neurosurgeons then certified.
Split into simpler sentences: She also trained neuropathologist Louise Eisenhardt, who became a renowned expert in diagnosing brain tumors. In 1959 she was credited with training 70% of the neurosurgeons then certified.