Complex sentence: He was a frequent writer in "the Gentleman's Magazine", and he gave John Nichols biographical hints and corrections for "A Select Collection of Miscellaneous Poems," "Anecdotes of Hogarth" and "History of Hinckley".
Split into simpler sentences: He was a frequent writer in "the Gentleman's Magazine", and he gave John Nichols biographical hints and corrections relative to "A Select Collection of Miscellaneous Poems". In a similar way he improved the same author's "Anecdotes of Hogarth" and "History of Hinckley".