Complex sentence: As objectors to the institution of slavery, the Chenoweths manumitted their slaves in 1853 over the existing legal obstacles to that course of action and the family moved to Washington, D.C. shortly thereafter.
Split into simpler sentences: As objectors to the institution of slavery, the Chenoweths manumitted their slaves in 1853 over the existing legal obstacles to that course of action. The family moved to Washington, D.C. shortly thereafter.