Complex sentence: On April 15,1848, the sea vessel "Pearl" docked on a Washington wharf, and the Edmonson sisters and four of their brothers joined a group of slaves in an attempt to reach the vessel and escape upon her to freedom in the North.
Split into simpler sentences: On April 15,1848, the sea vessel "Pearl" docked on a Washington wharf. The Edmonson sisters and four of their brothers joined a group of slaves in an attempt to reach the vessel and escape upon her to freedom in the North.