Original sentence: (Larkin's mother was widowed three times.)  After a stopover in the Sandwich Islands, he landed in San Francisco, California, in April 1832.Her third husband was named Richardson.Here he learned that his half-brother, John Bautista Rogers Cooper, needed his assistance with a business in California, and on 1831-09-05 Thomas left Boston on the ship Newcastle
Edited sentence: After a stopover in the Sandwich Islands, he landed in San Francisco, California, in April 1832.Here he learned that his half-brother, John Bautista Rogers Cooper, needed his assistance with a business in California, and in September 1831 Thomas left Boston on the ship Newcastle.Larkin's mother was widowed three times - her first husband was named Cooper and her third husband was named Richardson