Complex sentence: Though very popular in his time, Blackmore's work has since been altogether ignored, and his entire body of work, save for his magnum opus "Lorna Doone", which has enjoyed considerable popularity since its being published, has gone out of publication.
Split into simpler sentences: Though very popular in his time, Blackmore's work has since been altogether ignored. Save for his novel "Lorna Doone", which has enjoyed considerable ongoing popularity, his entire body of work has gone out of publication.