Simplify the following text for a Grade 6 native English-speaking person.
Original: Finnish partisans were involved in attempts to overthrow the Bolshevists in Russian Karelia ( East Karelia ) in 1918 â `` 20 , for instance in the failed Aunus expedition .
Simplified: In Russian side Karelia is Republic of Karelia . In Finnish side there are provinces of North Karelia and South Karelia .