Original sentence: In 2005, the borough erected over a dozen wayside markers at key spots along the city streets to help interpret the battle for visitors, and three years later the state added its own markers as part of the Pennsylvania Civil War Trials initiative
Edited sentence: In 2005, the borough erected over a dozen wayside markers at key spots along the city streets to help interpret the battle for visitors, and three years later the state added its own markers as part of the Pennsylvania Civil War Trails initiative