Complex sentence: The papers estimated the Yorkshire section of 40 3/4 miles could be constructed by 1,648 men with 744 carts; and the Lancashire/Westmorland section of 12¼ miles by 205 men with 133 carts.
Split into simpler sentences: The papers estimated the Yorkshire section of 40 3/4 miles could be constructed by 1,648 men with 744 carts. And the Lancashire/Westmorland section of 12¼ miles by 205 men with 133 carts.