Complex sentence: From 1851 Handel Cossham reopened some pits he believed had reserves; these were Brandybottom, at NGR ST682771 andCooks at NGR ST692777, and he developed a new engine pit at Parkfield, NGR ST689778 from 1858.
Split into simpler sentences: From 1851 Handel Cossham reopened some pits he believed had reserves; these were Brandybottom, at NGR ST682771 and Cooks at NGR ST692777. He also developed a new engine pit at Parkfield, NGR ST689778, from 1858.