Complex sentence: Like the Chien de St Hubert it was a scenthound, and formed part of the royal packs of France, which were composed, from about 1250 till 1470, exclusively of hounds of this type.
Split into simpler sentences: Like the Chien de St Hubert it was a scenthound, and once formed part of the pack of the Kings of France. One authority, states that the royal packs of France were composed, from about 1250 till 1470, exclusively of hounds of this type.