Complex sentence: He was successively sub-editor of the "Illustrated London News", editor of the "Pictorial Times", and on the establishment of the "Daily News" in 1846, was selected by Charles Dickens as one of the assistant editors.
Split into simpler sentences: He was successively sub-editor of the "Illustrated London News", and editor of the "Pictorial Times". On the establishment of the "Daily News" in 1846, he was selected by Dickens as one of the assistant editors.