Complex sentence: The "Hastings", also known as "Folkestone", was a class of five sloops built for the Royal Navy and the Royal Indian Navy in the interwar period, which went on to see service in the Second World War.
Split into simpler sentences: The "Hastings" class, also known as the "Folkestone" class, was a class of sloop which were built for the Royal Navy and the Royal Indian Navy in the interwar period. In total five ships were built, and went on to see service in the Second World War.