Complex sentence: After the peace treaty, Russia, Germany, and France forced Japan to withdraw from Liaodong Peninsula, soon afterwards Russia occupied the Liaodong Peninsula, built Port Arthur fortress and based the Russian Pacific Fleet in the port.
Split into simpler sentences: After the peace treaty, Russia, Germany, and France forced Japan to withdraw from Liaodong Peninsula. Soon afterwards Russia occupied the Liaodong Peninsula, built Port Arthur fortress, and based the Russian Pacific Fleet in the port.