Complex sentence: A number of PD1As had standard Leyland outline bodies licence-built by Walter Alexander Coachbuilders, two of these were supplied in completely knocked down (CKD) form for the Londonderry and Lough Swilly Railway Company who had them assembled in Derry.
Split into simpler sentences: A number of PD1As had standard Leyland outline bodies, licence-built by Walter Alexander Coachbuilders. Two of these were supplied in completely knocked down (CKD) form for the Londonderry & Lough Swilly Railway Company who had them assembled in Derry.