Complex sentence: Slaves were hidden from authorities in Byberry through a trap door that installed in the floor by Robert.She hosted meetings of abolitionists in her house and was a leader of the Female Vigilant Society, which provided monies for transportation and clothing to the travelers.
Split into simpler sentences: Slaves were hidden from authorities in their Byberry house through a trap door that installed in the floor by Robert. Harriet hosted meetings of abolitionists in her house and was a leader of the Female Vigilant Society, which provided monies for transportation and clothing to the travelers.