Complex sentence: In 1948 Douglass Hospital merged with another predominantly black hospital, Mercy, and in 1955 the new Mercy-Douglass Hospital building opened on Woodland Avenue, between 50th and 51st Streets, in West Philadelphia.
Split into simpler sentences: In 1948 Douglass Hospital merged with another predominantly black hospital, Mercy. In 1955 the new Mercy-Douglass Hospital building opened on Woodland Avenue, between 50th and 51st Streets, in West Philadelphia.