Complex sentence: The western entrance to the tunnel is located at the intersection of Cole and Carl Streets in Cole Valley, and the eastern entrance is at Duboce and Noe Streets, in the Duboce Triangle neighborhood adjacent to Duboce Park.
Split into simpler sentences: The western entrance to the tunnel is located near the intersection of Carl and Cole Streets in Cole Valley. The eastern entrance is at Duboce and Noe Streets, in the Duboce Triangle neighborhood adjacent to Duboce Park.