Complex sentence: The wizards and dragons successfully prevent E.N.D. 's resurrection and stop Acnologia's attack; however, Igneel is killed by Acnologia in battle, and the other dragons disappear, having previously lost their souls to the black dragon.
Split into simpler sentences: The wizards and dragons successfully prevent E.N.D. 's resurrection and stop Acnologia's attack. However, Igneel is killed by Acnologia in battle, and the other dragons disappear, having previously lost their souls to the black dragon.