Complex sentence: Nina's family returned to Venezuela in 1975, back to Caracas into her maternal grandmother's house, Marina Macía, who was a Colombian woman that landed in Caracas in 1948 to work as a seamstress.
Split into simpler sentences: Nina's family returned to Venezuela in 1975, back to Caracas into her maternal grandmother's house. Her grandmother, Marina Macía, was a Colombian woman that landed in Caracas in 1948, to work as a seamstress.