Complex sentence: A total of 53 were lost due to accidents or enemy action; one of these, "Fort Stikine", was destroyed in an explosion at Bombay, India that killed over 800 people and sank thirteen ships.
Split into simpler sentences: A total of 53 were lost due to accidents or enemy action. This event, known as the Bombay Explosion, killed over 800 people and sank thirteen ships.