Complex sentence: He ruled from 1841 to 1845, when he was deposed by his nephew Kosoko, and was reinstated with the help of British troops to rule from 1851 to his death in 1853.
Split into simpler sentences: He ruled from 1841 to 1845, when his nephew Kosoko deposed him. He was reinstated with the help of British troops and ruled from 1851 to his death in 1853.