Complex sentence: Only in 1945 the Imperial Family got the opportunity to depart to Brazil, they settle first in the Palace of Grão-Pará, in Petrópolis, Rio de Janeiro and then in a house of the neighborhood of Retiro.
Split into simpler sentences: Only in 1945 the Imperial Family got the opportunity to depart to Brazil. First, they settled in the Palace of Grão-Pará, in Petrópolis, Rio de Janeiro, later in a house of the neighborhood of Retiro.