Complex sentence: Four of the Chiffonnes 12 pounders had been landed and a battery constructed mounted on a plank platform defended by fascines and provided with a furnace for heating shot in an advantageous position for the protection of the frigate and the two small vessels at anchor.
Split into simpler sentences: Four of the Chiffonnes twelve pounders had been landed and a battery constructed mounted on a plank platform defended by fascines. A furnace was provided with a for heating shot in an advantageous position for the protection of the frigate and the two small vessels at anchor.