Complex sentence: It claims that, on the day of the rising, Littleton walked with Essex and Sir Christopher Blunt, with his sword drawn, until they reached the River Thames, having been turned away from St Paul's Cathedral by Richard Bancroft, the Bishop of London.
Split into simpler sentences: It claims that, on the day of the rising, Littleton walked with Essex and Sir Christopher Blunt, with his sword drawn, until they reached the River Thames. They had been turned away from St Paul's Cathedral by Richard Bancroft, the Bishop of London.