Complex sentence: There is no evidence that Fournier himself passed off any of his work as other than a facsimile, however, he always resisted attempts to identify his work as facsimiles by overprinting, marking on the reverse or any other method.
Split into simpler sentences: There is no evidence that Fournier himself passed off any of his work as other than a facsimile. However, he always resisted attempts to identify his work as facsimiles by overprinting, marking on the reverse or any other method.