Complex sentence: The only built prototype is known to have participated in the Battle of Moscow, in the 22nd Tank Brigade organic, together with its predecessors and successors, BT-7 and T-34 tanks.
Split into simpler sentences: The only built prototype is known to have participated in the Battle of Moscow. Later on, the tank was included in the 22nd Tank Brigade organic, together with its predecessors and successors, BT-7 and T-34 tanks.