Complex sentence: On 23 November 1721 Richardson married Martha Wilde, the daughter of his former employer, and it was "prompted mainly by prudential considerations" although Richardson would claim later that there was a strong love-affair between him and Martha.
Split into simpler sentences: On 23 November 1721 Richardson married Martha Wilde, the daughter of his former employer. The match was "prompted mainly by prudential considerations", although Richardson would claim later that there was a strong love-affair between him and Martha.