Complex sentence: From 1830 until 1865, the underground railroad, a system of safe houses and routes for slaves escaping to freedom, operated in Lycoming County; many local abolitionists, including Daniel Hughes, served as conductors and agents.
Split into simpler sentences: From 1830 until 1865 the underground railroad, a system of safe houses and routes for slaves escaping to freedom, was organized. Many Lycoming County abolitionists, including Daniel Hughes, served as conductors and agents.