Complex sentence: Bicknell around 1784 married Sabrina Sidney, the girl he had selected with Thomas Day at Shrewsbury about 15 years earlier; after Day dropped his plan to marry her, she had remained a ward of Richard Lovell Edgeworth.
Split into simpler sentences: Bicknell around 1784 married Sabrina Sidney, the girl he had selected with Thomas Day at Shrewsbury about 15 years earlier. After Day dropped his plan to marry her, she had remained a ward of Richard Lovell Edgeworth.