Complex sentence: In accordance with Robert Seppings' designs, in January 1820, "Aigle" had her square transom removed and a circular stern fitted, giving her improved protection in the rear and allowing a better field of fire.
Split into simpler sentences: In accordance with Robert Seppings' designs, in January 1820, "Aigle" had her square transom removed and a circular stern fitted. This gave her improved protection in the rear and allowed a better field of fire.