Complex sentence: The Center of Advanced Oral Health at A.T. Still University's Arizona School of Dentistry and Oral Health in Mesa, Arizona opened in 2014 to provide dentistry for those with advanced oral health needs developed in response to the complex needs of patients in underserved communities.
Split into simpler sentences: The Center of Advanced Oral Health, at A.T. Still University in Arizona School of Dentistry and Oral Health, opened in 2014 in Mesa. It provides dentistry for those with advanced oral health needs, and developed in response to the complex needs of patients in underserved communities.