Complex sentence: Originally ordered as a 24 gun ship to the draft of the French privateer Tyger, the ship, as well as the Lyme to the same draught, were modified to become the first true frigates of the Royal Navy.
Split into simpler sentences: Originally ordered as a 24 gun ship to the draft of the French privateer "Tyger". The third vessel of the Royal Navy to bear the name, the "Unicorn", as well as the "Lyme" which was a near-sister, were the first true frigates built for the Royal Navy.