Complex sentence: The HMS Orlando and her sister ship HMS Mersey were the longest wooden warships built for the Royal Navy at 336 feet overall was nearly twice the size of "HMS Victory", the flagship of Admiral Horatio Nelson at the Battle of Trafalgar.
Split into simpler sentences: The HMS Orlando and her sister ship HMS Mersey were the longest wooden warships built for the Royal Navy. At 336 feet in length, the HMS Orlando was nearly twice the size of "HMS Victory", the flagship of Admiral Horatio Nelson at the Battle of Trafalgar.