Complex sentence: Grace was allegedly born in Buenavista, Guimaras, Philippines to unmarried couple (Fernando or Pacito) Montañez and Victoria Rodriguez (died 1996); all three are deceased.
Split into simpler sentences: Grace was allegedly born in Buenavista, Guimaras, Philippines to an unmarried couple. Her natural father is reputed to be either Fernando or Pacito Montañez and her mother, Victoria Rodriguez (who died in 1996); all three are deceased.