Complex sentence: The tree kingfishers or wood kingfishers, family Halcyonidae, are the most numerous of the three families of birds in the kingfisher group, with between 56 and 61 species in around 12 genera, including e several species of kookaburras.
Split into simpler sentences: The tree kingfishers or wood kingfishers, family Halcyonidae, are the most numerous of the three families of birds in the kingfisher group. There are between 56 and 61 species of tree kingfisher in around 12 genera, and include several species of kookaburras.