Complex sentence: The Armstrong Whitworth 12 inch naval gun of 40-calibres produced by Elswick Ordnance Company was intended for the Royal Navy's "Royal Sovereign" class battleships, but budgetary constraints delayed their introduction.
Split into simpler sentences: The Armstrong Whitworth 12 inch naval gun of 40-calibre length was produced by Elswick Ordnance Company. It was intended for the Royal Navy's "Royal Sovereign" class battleships, but budgetary constraints delayed their introduction.