Complex sentence: Typically extremely energetic, acrobatic, and athletic, they frequently compete with great success in dog sports, in addition to their success in sheepdog trials, and are often cited as the most intelligent of all dogs.
Split into simpler sentences: Typically extremely energetic, acrobatic, and athletic, and highly intelligent. They frequently compete with great success in dog sports, in addition to their success in sheepdog trials, and are often cited as the most intelligent of all dogs.