Complex sentence: On 1 March 1678 or 1679, he married firstly Margaret Lowther, daughter of Sir John Lowther, 1st Baronet in St James's in London and around 1691, secondly Mary Lewis, daughter of William Lewis.
Split into simpler sentences: On 1 March 1678, he married firstly Margaret Lowther, daughter of Sir John Lowther, 1st Baronet in St James's in London. By 1691, he married secondly Mary Lewis, daughter of William Lewis.