Complex sentence: Six years later, the school established the Eliza B. Wallace Hospital, which served a dual purpose of training nurses and tending to the health needs of the local black community, and proved invaluable during the city's Influenza outbreak of 1918.
Split into simpler sentences: Six years later, the school established the Eliza B. Wallace Hospital, which served a dual purpose of training nurses and tending to the health needs of the local black community. The proved invaluable during the city's Influenza outbreak of 1918.