Complex sentence: His wife Käthe Schwammberger would die in 2003 at the age of 87 in Argentina before Schwammberger himself would die in prison on December 3,2004, aged 92.
Split into simpler sentences: His wife Käthe Schwammberger died in 2003 at the age of 87 in Argentina. Josef Schwammberger himself died in prison on December 3,2004, aged 92.