Simplify the following text for a Grade 7 native English-speaking person.
Original: A commander in the Royal Navy is above the rank of lieutenant-commander , below the rank of captain , and is equivalent in rank to a lieutenant colonel in the army .
Simplified: A commander in the Royal Navy is above the rank of Lieutenant-Commander , below the rank of Captain . It is equivalent in rank to a Lieutenant Colonel in the British Army and Wing Commander in the Royal Air Force .