Complex sentence: On 4 June 1785, Knatchbull married secondly Frances Graham, daughter of John Graham and on 13 April 1801, thirdly Mary Hawkins, daughter of Thomas Hawkins in St George's Church in London.
Split into simpler sentences: On 4 June 1785, Knatchbull married secondly Frances Graham, daughter of John Graham and on 13 April 1801. His third marriage was to Mary Hawkins, daughter of Thomas Hawkins in St George's Church in London.