Complex sentence: The Soviets made no attempt to aid the uprising, concentrated on the west bank, instead the 47th Army concentrated on securing Soviet positions east of the river, not providing the insurgents even with artillery support.
Split into simpler sentences: The Soviets made no attempt to aid the uprising, concentrating on securing the west bank. Instead the 47th Army concentrated on securing Soviet positions east of the river, not providing the insurgents even with artillery support.