Complex sentence: It's probable these are only a small portion of his own work; his extensive library was largely dispersed before his death but it is possible music composed by him and furniture designed by him may yet turn up in the possession of his family's decendants.
Split into simpler sentences: It's probable these are only a small portion of his own work; his extensive library was largely dispersed before his death. It is possible music composed by him and furniture designed by him may yet turn up in the possession of his family's decendants.