Complex sentence: Tebbs became a member of the National Democratic Party, and an active member of the pro-slavery movement, and following the Kansas free-state victory in 1857, Tebbs and his family moved to Hamburg, Arkansas, where he again opened a medical practice.
Split into simpler sentences: Tebbs became a member of the National Democratic Party, and an active member of the pro-slavery movement. Following the Kansas free-state victory in 1857, Tebbs and his family moved to Hamburg, Arkansas, where he again opened a medical practice.