Complex sentence: The Brazilian Air Force sponsored the EMB-312 project at the end of 1978, design and development work began in 1979 on a low cost relatively simple new basic trainer with innovative features which ended up becoming the international standard for basic training aircraft.
Split into simpler sentences: The Brazilian Air Force sponsored the EMB-312 project at the end of 1978. Design and development work began in 1979 on a low-cost, relatively simple new basic trainer with innovative features which eventually became the international standard for basic training aircraft.