Complex sentence: In the fluoronium ion, the hydrogen fluoride is coordinated to the hydrogen, although the molecule is formally classified as noncoordinating, because it is both a very weak nucleophile and a very weak base.
Split into simpler sentences: In the fluoronium ion, the hydrogen fluoride is coordinated to the hydrogen ion. The anion is classified as noncoordinating and is both a very weak nucleophile and a very weak base.