Complex sentence: Due to Dr. Hahn's influence, the school has a strong connection with Germany and forms part of the Round Square Conference of Schools, a group of over 80 schools across the globe also founded by Hahn.
Split into simpler sentences: Due to Dr. Hahn's influence, the school has had a strong connection with Germany. It is part of the Round Square Conference of Schools, a group of more than 80 schools across the globe also founded by Hahn.