Complex sentence: Scanner was one of the very few mutants to survive Cassandra Nova's Sentinel attack on Genosha as she was revealed to have been depowered along with 90% of the Earth's mutants thanks to none other than her leader's daughter, the Scarlet Witch.
Split into simpler sentences: Scanner was one of the very few mutants to survive Cassandra Nova's Sentinel attack on Genosha. Recently, however, she was revealed to have been depowered along with 90% of the Earth's mutants thanks to none other than her leader's daughter, the Scarlet Witch.