Complex sentence: In 1911, he became president of the Societies of the Scientific Committee and, in 1913, he took part in the Organizational Committee of the Academy of Geology in Krakow.
Split into simpler sentences: In 1911, he became president of the Societies of the Scientific Committee. Two years later, in 1913, he took part in the Organizational Committee of the Academy of Geology in Krakow.