Complex sentence: The youngest of their three children, he was educated at Merchant Taylors' School from 1794 to 1800, he was articled to a solicitor, but joined the army in 1811.
Split into simpler sentences: The youngest of their three children, he was educated at Merchant Taylors' School from 1794 to 1800. On leaving he was articled to a solicitor, but joined the army in 1811.