Complex sentence: At the time of the delivery, Bousada was the world's oldest documented mother, surpassing the record established in 2005 by Romanian mother Adriana Iliescu, who was also 66.
Split into simpler sentences: At the time of the delivery, Bousada was the world's oldest documented mother. She eclipsed the record established in 2005 by Romanian mother Adriana Iliescu, who was also 66.