Complex sentence: She was anchored off the bar at Santiago 8 May 1846 during the Battle of Palo Alto and she maintained a blockading station off the east coast of Mexico for the remainder of the war.
Split into simpler sentences: She was anchored off the bar at Santiago 8 May 1846 during the Battle of Palo Alto. She then maintained a blockading station off the east coast of Mexico for the remainder of the war.