Complex sentence: Returning to Cincinnati, he was married, Jan.7,1864, to Jean Springer, daughter of Charles Springer, and thereafter gradually withdrew from active practice and devoted himself to travel and literary pursuits.
Split into simpler sentences: Returning to Cincinnati, he married Jean Springer, daughter of Charles Springer, on Jan.7,1864. After his marriage, Mills gradually withdrew from active practice and devoted himself to travel and literary pursuits.