Complex sentence: After 16 years, the league became uncompetitive and dominated due to the increasing large enrollments of the (AAAA) schools in the Poconos from Monroe County (P. Mountain, Pleasant Valley, Stroudsburg, and East Stroudsburg).
Split into simpler sentences: After 16 years, the league became uncompetitive and dominated by the larger schools. This was due to the increasing large enrollments of the (AAAA) schools in the Poconos from Monroe County (P. Mountain, Pleasant Valley, Stroudsburg, and East Stroudsburg).