Complex sentence: The first chairman was the geographer and former director of the Baltic Institute, Stanisław Srokowski; the other commission members were the linguists Kazimierz Nitsch, Mikołaj Rudnicki, Stanisław Rospond and Witold Tszycki; a specialist in toponyms; and the historian Władysław Semkowicz.
Split into simpler sentences: The first chairman was the geographer and former director of the Baltic Institute, Stanisław Srokowski. The other commission members were the linguists Kazimierz Nitsch, Mikołaj Rudnicki, Stanisław Rospond and Witold Tszycki; a specialist in toponyms; and the historian Władysław Semkowicz.