Simplify the following text for a Grade 8 native English-speaking person.
Original: Two years later , under pressure from the Allies ( especially France , desperate to open a new front ) , on 14\/27 August 1916 , Romania joined the Allies , declaring war on Austria-Hungary .
Simplified: In 1916 , after pressure from the Allies , Romania joined the Allies . Romania then started a war against Austria-Hungary .