Complex sentence: Dimitri has been captured by German soldiers in an abandoned house, but is saved when the Red Army attacks the house and he is re-united with Reznov and introduced to his right-hand-man Pvt. Chernov.
Split into simpler sentences: Dimitri has been captured by German soldiers in an abandoned house. He is saved when the Red Army attacks the house and he is re-united with Sgt. Reznov and introduced to his right-hand-man Pvt. Chernov.