Complex sentence: The issues in this internal split were the same issues raised in the internal split within the Communist League, but Marx lost the fight with the Schapper/Willich faction within the German Workers' Educational Society and on 17 September 1850 resigned from the Society.
Split into simpler sentences: The issues in this internal split were the same issues raised in the internal split within the Communist League. Marx, however, lost the fight with the Schapper/Willich faction within the German Workers' Educational Society and, on 17 September 1850, resigned from the Society.