Complex sentence: Evheny is later sent to a front-line Waffen SS formation on the Eastern Front while Vitaly is posted to northern Italy as part of German antipartisan activity in the wake of that country's withdrawal from the Axis alliance.
Split into simpler sentences: Evheny is later sent to a front-line Waffen SS formation on the Eastern Front, while Vitaly is posted to northern Italy. He is part of German anti-partisan activity in the wake of Italy's withdrawal from the Axis alliance.