Complex sentence: He has also written a preface for Pollok's "Tales of the Covenanters" but is easy to get confused with the "other" Andrew Thomson, also of Edinburgh, who was prominent in the "Disruption" of 1843.
Split into simpler sentences: He has also written a preface for Pollok's "Tales of the Covenanters". He should not be confused with the' other' Andrew Thomson, also of Edinburgh, who was prominent in the Disruption of 1843.