Complex sentence: According to persistent rumours, Finnish army held secret court-martials for the deserters in Lappeenranta during the Continuation War in 1944, and the convicted deserters were then moved to Huhtiniemi, executed by firing squad, and buried in unmarked graves.
Split into simpler sentences: According to persistent rumours, the Finnish Army held secret military tribunals for deserters in Lappeenranta during the Continuation War in 1944. Convicted deserters were then moved to Huhtiniemi, executed by firing squad, and buried in unmarked graves.