Complex sentence: St. Mary's Residential Central School, Tiruvalla, one of the best senior secondary schools in south India, was established in way way before by St. Mary's Educational and Cultural Society Tiruvalla, a registered charitable Trust.
Split into simpler sentences: St. Mary's Residential Central School, Tiruvalla is a senior secondary schools in Tiruvalla, India. It was established by St. Mary's Educational and Cultural Society Tiruvalla, a registered charitable Trust.