Complex sentence: Padme later dies during the birth of her twins of a broken heart, caused by Anakin's descent to the dark side; ironically, the dark side brings on the very tragedy Anakin joined the Sith to prevent.
Split into simpler sentences: Padme later dies during the birth of her twins of a broken heart, caused by Anakin's descent to the dark side. Ironically, the dark side brings on the very tragedy Anakin joined the Sith to prevent.