Simplify the following text for a Grade 10 native English-speaking person.
Original: The collapse of the Russian front presented a tremendous problem to the Entente powers , since not only did it allow Germany to shift troops and war material from its eastern front to the west , but it also made it possible for Germany to secure the huge stockpiles of supplies that had been accumulating at Murmansk , Arkhangelsk and Vladivostok .
Simplified: The peace agreement also allowed Germany to get many supplies from Murmansk , Arkhangelsk and Vladivostok .