Complex sentence: Kea can solve logical puzzles, such as pushing and pulling things in a certain order to get to food, and will work together to achieve a certain objective, and some have the intelligence of an average six-year-old.
Split into simpler sentences: Kea can solve logical puzzles, such as pushing and pulling things in a certain order to get to food, and will work together to achieve a certain objective. Some have the intelligence of an average six-year-old.