Here's the breakdown:
* Vosotros sois de Perú means "You all are from Peru".
* Vosotras sois peruanas means "You all (female) are Peruvian".
The first sentence uses "vosotros" which is a formal/plural pronoun for "you" (masculine or mixed gender). The second sentence uses "vosotras" which is a formal/plural pronoun for "you" (feminine).
Depending on the context, the correct translation could be one of the following:
* You all are from Peru
* You all (female) are Peruvian
It's important to understand the context to choose the correct translation.