Complex sentence: In 1951 Maidstone called briefly at Corunna to land a sick rating, but this was not classified an official visit, although it was the first time a British warship had entered a Spanish harbour since the end of the Spanish Civil War.
Split into simpler sentences: In 1951 Maidstone called briefly at Corunna to land a sick crew man. This was not classified an official visit, although it was the first time a British warship had entered a Spanish harbour since the end of the Spanish Civil War.