Complex sentence: But most of that album was lost due to a house fire, but a raw version of "Winterspell" still exists and he also recreated two of the songs that he now calls the "Mourning Star" Project.
Split into simpler sentences: But most of that album was lost due to a house fire. However, a raw version of "Winterspell" still exists and he also recreated two of the songs that he now calls the "Mourning Star" Project.