Complex sentence: She is the sixth of seven Trafalgar class hunter killer submarines, built by Barrow-in-Furness, HMS Talent was launched by The Princess Royal in April 1988 and commissioned in May 1990.
Split into simpler sentences: She is the sixth of seven "Trafalgar"-class hunter killer submarines, built by Barrow-in-Furness. HMS "Talent" was launched by The Princess Royal in April 1988 and commissioned in May 1990.