Complex sentence: Scops owls in the modern sense are restricted to the Old World, except for a single North American species--the Flammulated Owl--that is only provisionally placed here and has now been moved out of "Otus", to its own monotypic genus.
Split into simpler sentences: Scops owls in the modern sense are restricted to the Old World. A single North American species--the Flammulated Owl was provisionally placed in "Otus" and has now been moved to its own monotypic genus.