Complex sentence: Dutch Admiral Tromp's new flag ship "Brederode" was the largest ship in the Dutch navy; but Britain had 18 ships superior in firepower to the "Brederode".
Split into simpler sentences: Dutch Admiral Tromp's new flag ship, "Brederode" was the largest ship in the Dutch navy. However, Britain had eighteen ships superior in firepower to the heaviest Dutch vessel, the "Brederode".