Complex sentence: Couts was appointed sub-agent for the native Luiseño people (San Luis Rey Mission Indians) in 1853, and used their enslaved labor to improve his properties in the area, including this one and nearby Rancho Buena Vista and Rancho Vallecitos de San Marcos.
Split into simpler sentences: Couts was appointed sub-agent for the native Luiseño people (San Luis Rey Mission Indians) in 1853. He used their enslaved labor to improve his properties in the area, including this one and nearby Rancho Buena Vista and Rancho Vallecitos de San Marcos.