Complex sentence: In the ensuing duel, Optimus kills Attinger, avenging the deaths of his fellow Autobots, allowing Lockdown to pin Optimus down by impaling him through the chest with his own sword, damaging his spark.
Split into simpler sentences: In the ensuing duel, Optimus kills Attinger, avenging the deaths of his fellow Autobots. But this allows Lockdown to pin Optimus down by impaling him through the chest with his own sword, damaging his spark.