Complex sentence: In early life he married Jane Elizabeth Brand, of Maryland, when stationed in New Orleans, with whom he had four children, and in 1860 he married Anna E. Hall of Harford County, Maryland, with whom he had three children.
Split into simpler sentences: In early life he married Jane Elizabeth Brand, of Maryland, when stationed in New Orleans, with whom he had four children. In 1860 he married Anna E. Hall of Harford County, Maryland, with whom he had three children.