List down the official language of the countries which declared independence after 1990,
official lanaguage refers to IsOfficial = 'T'; declared independence after 1990 refers to IndepYear > 1990;
SELECT T1.Name, T2.Language FROM Country AS T1 INNER JOIN CountryLanguage AS T2 ON T1.Code = T2.CountryCode WHERE T1.IndepYear > 1990 AND T2.IsOfficial = 'T'