Complex sentence: 'She kept the boxes for a year, unsure of what to do with them, but, in 2004, the house mysteriously burnt down, and she decided to begin tracing the life of' Larry' through her artwork.
Split into simpler sentences: ' She kept the boxes for a year, unsure of what to do with them. In 2004, the house burnt down, and she decided to begin tracing the life of "Larry" in her artwork.