Complex sentence: He married Maitland Mackintosh, daughter of Sir James Mackintosh by his first wife Katherine Stuart in 1809 in Madras (now Chennai) and they had fourteen children, one of whom, Frances, married the statistician and civil servant Thomas Farrer, 1st Baron Farrer.
Split into simpler sentences: He married Maitland Mackintosh, daughter of Sir James Mackintosh by his first wife Katherine Stuart, in 1809 in Madras (now Chennai). They had fourteen children, one of whom, Frances, married the statistician and civil servant Thomas Farrer, 1st Baron Farrer.