Complex sentence: When John Ashley appealed to the law to force her to return, Mum Bett sought the counsel of Theodore Sedgwick, an abolitionist-minded lawyer, who in turn enlisted the aid of Tapping Reeve, the founder of America's first law school.
Split into simpler sentences: When John Ashley appealed to the law to force her to return, Mum Bett sought the counsel of Theodore Sedgwick, an abolitionist-minded lawyer. Sedgwick then enlisted the aid of Tapping Reeve, the founder of America's first law school.