Ameliorate John Brown

Directions: there are four missing commas and three sentences. Please use at least one semicolon and two periods. 

John Brown a radical abolitionist advocated the use of armed insurrection to overthrow the slavery he fought pro-slavery groups at Bleeding Kansas in 1856 in 1859 Brown attempted to start a slave rebellion at Harper's Ferry Virginia.

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Suggested Answer:
John Brown, a radical abolitionist, advocated the use of armed insurrection to overthrow the slavery; he fought pro-slavery groups at Bleeding Kansas in 1856. In 1859, Brown attempted to start a slave rebellion at Harper's Ferry, Virginia.