Complex sentence: However, unbeknown to Skorzeny, the Red Army reinforcements were those belonging to the 61st Army and 1st Polish Army of 1st Belorussian Front's northern flank with orders to bypass Schwedt, and attack in the direction of Eberswalde.
Split into simpler sentences: However, unbeknown to Skorzeny, the Red Army reinforcements were those belonging to the 61st Army and the 1st Polish Army of the 1st Belorussian Front's northern flank. They had orders to bypass Schwedt and attack in the direction of Eberswalde.