Complex sentence: In 1895 Struve completed his studies at the university, wrote an "Open letter to Nicholas II" on behalf of Zemstvo and went abroad for further studies, where he attended the 1896 International Socialist Congress in London.
Split into simpler sentences: In 1895 Struve finished his degree and wrote an "Open letter to Nicholas II" on behalf of Zemstvo. He then went abroad for further studies, where he attended the 1896 International Socialist Congress in London.