Complex sentence: The most famous animal in the park is the unusual mallee fowl, the only mound-building bird to live in an arid region, and there is also the solitary insectivorous Southern Scrub-robin.
Split into simpler sentences: The most famous animal in the park is the unusual Malleefowl, the only mound-building bird to live in an arid region. There is also the solitary insectivorous Southern Scrub-robin.