Complex sentence: On January 30,1586 he married Virginia de'Medici, daughter of Cosimo I de' Medici, who suffered increasing symptoms of madness, until her death in 1615.
Split into simpler sentences: On January 30,1586 he married Virginia de'Medici, daughter of Cosimo I de' Medici. She however suffered of increasing symptoms of madness, until her death in 1615.