Complex sentence: The Battle of Tienhaara was a part of Continuation War between Finland and the Soviet Union, troops on the Finnish side were commanded by Colonel Alpo Marttinen who led the JR61 (Infantry Regiment 61) a swedish speaking regiment.
Split into simpler sentences: The Battle of Tienhaara was a part of Continuation War between Finland and the Soviet Union. The Finnish troops on were commanded by Colonel Alpo Marttinen who led the JR61 (Infantry Regiment 61) a Swedish speaking regiment.