Complex sentence: He said that he was part of a company of 50 soldiers who were attacked starting at 00:20 by around 150 attackers whom even had a Doçka (a Soviet heavy anti-aircraft machine gun).
Split into simpler sentences: He said that he was part of a company of 50 people. He added that the attack started at 00:20 and that estimated that there were around 150 attackers whom even had a Doçka (a Soviet heavy anti-aircraft machine gun).