Complex sentence: While its advance tied down some Soviet troops Talvela who commanded the Finnish VI Corps assessed that Group Oinonen's mission had been a resounding failure however he also criticized his superior's orders to use these lighter troops against known strong Soviet positions.
Split into simpler sentences: While its advance tied down some Soviet troops, Talvela who commanded the Finnish VI Corps assessed that Group Oinonen's mission had been a resounding failure. However he also criticized his superior's orders to use these lighter troops against known strong Soviet positions.