Complex sentence: In August 1977, the Royal Preparatory School was amalgamated to Royal College forming the school's primary school, with it came the country's only national theatre at the time the Navarangahala.
Split into simpler sentences: In August 1977, the Royal Preparatory School was amalgamated to Royal College forming the school's primary school. With it came the country's only national theatre at the time, the Navarangahala.