Complex sentence: The school rented the country house for two years, before moving to KM 10.5 Carretera Sur; classes at the current campus began in 1972, and the primary school was fully established in 1975.
Split into simpler sentences: The school rented the country house for two years, before moving to KM 10.5 Carretera Sur. Classes at the current campus began in 1972, and the primary school was fully established in 1975.