Complex sentence: Brazil's extradition treaty with the United Kingdom at the time did not allow the parent of a Brazilian child to be extradited; the treaty has since been changed and extradition is allowed even under circumstances such as Biggs'.
Split into simpler sentences: Brazil's extradition treaty with the United Kingdom at the time did not allow the parent of a Brazilian child to be extradited. The treaty has since been changed and extradition is allowed even under circumstances such as Biggs'.