Complex sentence: Zhu went to Europe, studying at Göttingen University in Germany from 1922 to 1925 at which point he met Zhou Enlai and was expelled from the country by the government for his role in a number of student protests.
Split into simpler sentences: Zhu went to Europe, studying at Göttingen University in Germany until 1925. Here he met Zhou Enlai and was expelled from Germany for his role in a number of student protests.