Complex sentence: Antonia refuses to give Marcelo his heart pills, causing Marcelo to die a painful death, with Antonia immediately being revealed as an ambitious woman who also killed her first husband, the father of her two sons.
Split into simpler sentences: Antonia refuses to give Marcelo his heart pills, causing Marcelo to die a painful death. Antonia is revealed as an ambitious woman who also killed her first husband, the father of her two sons.