Complex sentence: Although regarded as indestructible, the original comics revealed adamantium was penetrable by bullets made of the same alloy; also, Wolverine was killed by adamantium bullets in "the fall of wolverine".
Split into simpler sentences: Although regarded as indestructible, the original comics revealed adamantium was penetrable by bullets made of the same alloy. Also, Wolverine was killed by adamantium bullets in "The Fall of Wolverine".