Complex sentence: In 1782 he first exhibited at the Royal Academy and in December of that year was married to Mary Bunn-though the match proved to be an unhappy one and they were eventually divorced in 1796 after her elopement.
Split into simpler sentences: In 1782 he first exhibited at the Royal Academy and in December of that year was married to Mary Bunn. The match, however, proved to be an unhappy one and they were eventually divorced in 1796 after her elopement.