Complex sentence: In the early hours of September 21, fire broke out in the city, according to the eyewitness account of John Joseph Henry, an American prisoner aboard the HMS "Pearl", in the Fighting Cocks Tavern, near Whitehall Slip.
Split into simpler sentences: In the early hours of September 21, fire broke out in the city. According to the eyewitness account of John Joseph Henry, an American prisoner aboard the HMS "Pearl", it began in the Fighting Cocks Tavern, near Whitehall Slip.