Complex sentence: That school was so successful that its model was sought in other cities, and the Cristo Rey Network was formed and in 2015 supported 30 schools across the country, including Cristo Rey Jesuit in Fell's Point.
Split into simpler sentences: That school was so successful that its model was sought in other cities. The Cristo Rey Network was formed, and in 2015, supported 30 schools across the country, including Cristo Rey Jesuit in Fell's Point.