The goal of this task is to translate questions in Catalan into English. The requirements of the translation is that: the text must be equivalent in meaning, the text must not be ambiguous, and the text must be written as a question
One example: Quants punts va cedir la defensa dels Panthers?
Solution is here: How many points did the Panthers defense surrender?
Explanation: This is a good English translation because it conveys the same meaning as the Catalan question.

Now, solve this: Quan es va sotmetre Renània al Tractat de Versalles?
Solution:
When was Europe fully forested and recovered from the last Ice Age?