Complex sentence: In early September she again entered the Gulf of Mexico to take part in the strangling blockade of Southern commerce, but boiler trouble sent her north on 21 September he arrived New York 2 October and decommissioned 6 October 1862 for repairs.
Split into simpler sentences: In early September she again entered the Gulf of Mexico to take part in the strangling blockade of Southern commerce, but boiler trouble sent her north 21 September. She arrived New York 2 October and decommissioned 6 October 1862 for repairs.