Complex sentence: There are also 23 paracompact Coxeter groups of rank 4 that produce parcompact uniform honeycombs in hyperbolic space with infinite or unbounded facets or vertex figure, including ideal vertices at infinity.
Split into simpler sentences: There are also 23 paracompact Coxeter groups of rank 4. These families produce parcompact uniform honeycombs in hyperbolic space with infinite or unbounded facets or vertex figure, including ideal vertices at infinity.