Complex sentence: In 1849, Blunt was appointed to a Joint Commission of Army and Navy Offices to accompany the Pacific Coast Survey and identify potential sites for forts and navy bases along the Pacific Coast of the California and Oregon territories.
Split into simpler sentences: In 1849, Blunt was appointed to the Joint Commission of Army and Navy Offices to accompany the Pacific Coast Survey. The Joint Commission's mission was to identify potential sites for forts and navy bases along the Pacific Coast of the California and Oregon territories.