Complex sentence: Starscream is confronted by Dreadwing and battles him, with Dreadwing winning nearly killing Starscream due to his disgust of him, but is stopped by Ultra Magnus, who tells him that the Autobots only use lethal force when it is absolutely necessary.
Split into simpler sentences: Starscream is confronted by Dreadwing and battles him, with Dreadwing winning and nearly killing Starscream due to his disgust of him. He is stopped by Ultra Magnus, who tells him that the Autobots only use lethal force when it is absolutely necessary.