Complex sentence: His passionate enmity of slavery fueled by his Quaker beliefs, Lay made several dramatic demonstrations against the practice, the most notable at the 1738 Philadelphia Yearly Meeting of Quakers.
Split into simpler sentences: His passionate enmity of slavery fueled by his Quaker beliefs, Lay made several dramatic demonstrations against the practice. The most notable act occurred at the 1738 Philadelphia Yearly Meeting of Quakers.